Dynamic fit adjustment for wearable electronic devices

ABSTRACT

Systems and methods for dynamically adjusting the fit of a wearable electronic device are disclosed. In many embodiments, a tensioner associated with a wearable electronic device can control one or more actuators that are mechanically coupled to either the housing or to a band attached to the wearable electronic device. In one example, in response to a signal to increase the tightness of the band, the tensioner can cause the actuator(s) to increase the tension within the band.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of Ser. No. 15/728,349, filed Oct. 9,2017, which is a continuation of U.S. patent application Ser. No.14/691,217, filed Apr. 20, 2015, now issued as U.S. Pat. No. 9,781,984,which claims the benefit of U.S. Provisional Patent Application No.62/129,950, filed Mar. 8, 2015 and titled “Dynamic Adjustment forWearable Electronic Devices,” the disclosures of which are herebyincorporated herein by reference in their entirety.

TECHNICAL FIELD

Embodiments described herein relate to systems and methods for affixingan electronic device to an object and, more particularly, to systems andmethods for dynamic adjustment of the fit of wearable electronicdevices.

BACKGROUND

Some electronic devices may be removably attached to a user. Forexample, a wristwatch or fitness/health tracking device can be attachedto a user's wrist by joining free ends of a watch band together.

In many cases, watch bands may have limited fit adjustment incrementsavailable. For example, some bands have an incrementally user-adjustablesize (e.g., a buckling clasp, pin and eyelet, etc.) whereas other bandshave a substantially fixed size, adjustable only with specialized toolsand/or expertise (e.g., folding clasp, deployment clasp, snap-fit clasp,etc.). Still other bands may be elasticated expansion-type bands thatstretch to fit around a user's wrist.

In many cases, conventional watch bands may catch, pinch, or pull auser's hair or skin during use if the band is overly tight. In othercases, watch bands may slide along a user's wrist, turn about a user'swrist, or may be otherwise uncomfortable or bothersome to a user if theband is overly loose. These problems can be exacerbated during periodsof heightened activity, such as while running or playing sports.Furthermore, adjusting the size or fit of conventional watch bands oftenrequires multiple steps, specialized tools, and/or technical expertise.In other cases, sizing options available to a user may be insufficientto obtain a proper fit. In still further examples, the fit may bedifferent and/or may be perceived to be different given certainenvironmental (e.g. temperature, humidity) or biological conditions(e.g., sweat, inflammation). As a result, users of conventionalwristwatches and/or fitness/health tracking devices may select atolerable (although not optimally comfortable) fit, reserving tightbands for fitness/health tracking devices and loose bands forconventional wristwatches.

However, some wearable electronic devices (such as smart watches) may bemulti-purpose devices, providing in one example both fitness/healthtracking and timekeeping functionality. Accordingly, a user may preferthe fit of a smart watch to vary with use. For example, a user mayprefer a looser fit in a timekeeping mode and a tighter fit in afitness/health tracking mode.

Accordingly, there may be a present need for systems and methods fordynamic adjustment of the fit of wearable electronic devices.

SUMMARY

Embodiments described herein may relate to, include, or take the form ofa method of adjusting the fit of a wearable electronic device secured bya band to a user, the method including at least the operations ofreceiving a signal with an instruction to adjust the fit of the band,selecting an operational mode (e.g., tightening mode, loosening mode,flexibility mode, rigid mode, etc.) of a tensioner coupled to electronicdevice, and actuating the tensioner based on the instruction.

Further embodiments described herein may relate to, include, or take theform of a method of soliciting attention of a user by adjusting the fitof a wearable electronic device secured to the user by a band, themethod including at least the operations of receiving an instruction tosolicit attention of the user, and in response, actuating a tensionercoupled to the wearable electronic device to cause an increase in thetightness of the band.

Other embodiments described herein may relate to, include, or take theform of a method of restraining a wearable electronic device secured bya strap to a user engaged in physical activity, the method including atleast the operations of receiving an indication that the user may beengaged in physical activity, and in response, actuating a tensionercoupled to the wearable electronic device to increase the tightness ofthe strap.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference will now be made to representative embodiments illustrated inthe accompanying figures. It should be understood that the followingdescriptions are not intended to limit the disclosure to one preferredembodiment. To the contrary, each is intended to cover alternatives,modifications, and equivalents as may be included within the spirit andscope of the described embodiments as defined by the appended claims.

FIG. 1A depicts a perspective view of an example wearable electronicdevice loosely attached by a band to a user.

FIG. 1B depicts a perspective view of an example wearable electronicdevice tightly attached by a band to a user.

FIG. 2A depicts a top plan view of an example wearable electronic devicewith a two-piece band system for attaching to a user.

FIG. 2B depicts a side plan view of an example wearable electronicdevice with an overlapping two-piece band system for attaching to auser.

FIG. 2C depicts a side plan view of an example wearable electronicdevice with a mortise-tenon band system for attaching to a user.

FIG. 2D depicts a side plan view of an example wearable electronicdevice with an interlacing band system for attaching to a user.

FIG. 3A depicts a simplified block diagram of a wearable electronicdevice.

FIG. 3B depicts a perspective view of an example wearable electronicdevice depicting a user instructing the wearable electronic to adjustthe fit of the band.

FIG. 4A depicts a top plan view of an example wearable electronic devicewith a two-piece band system configured to contract along its length inresponse to an electrical signal from a tensioner.

FIG. 4B depicts a top plan view of the example wearable electronicdevice of FIG. 4A, showing the two-piece band system in a contractedconfiguration.

FIG. 4C depicts a top plan view of another example wearable electronicdevice with a two-piece band system configured to partially contractalong its length in response to an electrical signal from a tensioner.

FIG. 4D depicts a side plan view of another example wearable electronicdevice with a two-piece band system configured to contract along itsthickness in response to an electrical signal from a tensioner.

FIG. 5A depicts a top plan view of an example wearable electronic devicewith a two-piece band system configured to retract into the body of thewearable electronic device in response to an electrical signal from atensioner.

FIG. 5B depicts a side plan view of the example wearable electronicdevice of FIG. 5A showing a lug-based band attachment system.

FIG. 5C depicts another side plan view of the example wearableelectronic device of FIG. 5A showing a channel-based attachment system.

FIG. 5D depicts another side plan view of the example wearableelectronic device of FIG. 5A showing a permanent attachment system.

FIG. 6A depicts a top plan view of an example wearable electronic devicewith a segmented band system configured to contract along its length inresponse to an electrical signal from a tensioner.

FIG. 6B depicts a top plan view of the example wearable electronicdevice of FIG. 6A, showing the segmented band system in a contractedconfiguration.

FIG. 7A depicts a top plan view of an example wearable electronic devicewith a woven band system configured to contract along its length and/orwidth in response to an electrical signal from a tensioner.

FIG. 7B depicts a detail view of the example wearable electronic deviceof FIG. 7A.

FIG. 7C depicts a detail view of the example wearable electronic deviceof FIG. 7A, showing the woven band system in a contracted configuration.

FIG. 8A depicts a top plan view of an example wearable electronic devicewith a two-part band system, each band configured to slide relative tothe other band in response to an electrical signal from a tensioner.

FIG. 8B depicts a side plan view of the example wearable electronicdevice of FIG. 8A.

FIG. 8C depicts a side plan view of the example wearable electronicdevice of FIG. 8A in a contracted configuration.

FIG. 9 depicts a side plan view of an example wearable electronic devicewith a bracelet-style band system configured to rotate the housing ofthe wearable electronic device toward or away from a user's wrist inresponse to an electrical signal from a tensioner.

FIG. 10 depicts a side plan view of an example wearable electronicdevice with a loop-style band system configured to tighten or loosen theloop in response to an electrical signal from a tensioner.

FIG. 11A depicts a side plan view of an example wearable electronicdevice with a bladder-style band system configured to increase ordecrease pressure within one or more bladders in response to anelectrical signal from a tensioner.

FIG. 11B depicts a side plan view of the example wearable electronicdevice of FIG. 11A, depicting inflated bladders.

FIG. 12A depicts a side plan view of an example wearable electronicdevice with another bladder-style band system configured to increase ordecrease pressure within one or more bladders in response to anelectrical signal from a tensioner.

FIG. 12B depicts a side plan view of the example wearable electronicdevice of FIG. 12A, depicting inflated bladders.

FIG. 13A depicts a side plan view of an example wearable electronicdevice with an extendable housing portion configured to extend toward orretract from a user's skin in response to an electrical signal from atensioner.

FIG. 13B depicts a side plan view of the example wearable electronicdevice of FIG. 13A, depicting an extended housing portion.

FIG. 14A depicts a side plan view of an example wearable electronicdevice with an extendable buckle portion configured to extend toward orretract from a user's skin in response to an electrical signal from atensioner.

FIG. 14B depicts a side plan view of the example wearable electronicdevice of FIG. 14A depicting an extended buckle portion.

FIG. 15A depicts a side plan view of an example wearable electronicdevice with another extendable housing portion configured to extendtoward or retract from a user's skin in response to an electrical signalfrom a tensioner.

FIG. 15B depicts a side plan view of the example wearable electronicdevice of FIG. 15A, depicting an extended housing portion.

FIG. 16 depicts a top plan view of an example wearable electronic devicewith another two-piece band system configured to retract toward the bodyof the wearable electronic device in response to an electrical signalfrom a tensioner.

FIG. 17 depicts a top plan view of an example wearable electronic devicewith another two-piece band system configured to retract into the bodyof the wearable electronic device in response to an electrical signalfrom a tensioner.

FIG. 18 depicts a top plan view of an example wearable electronic devicewith another two-piece band system configured to retract toward the bodyof the wearable electronic device in response to an electrical signalfrom a tensioner.

FIG. 19A depicts a top plan view of an example wearable electronicdevice with another two-piece band system configured to contract alongits length in response to an electrical signal from a tensioner or inresponse to a user input.

FIG. 19B depicts a side plan view of the example wearable electronicdevice of FIG. 19A in a closed configuration.

FIG. 20A depicts a side plan view of an example wearable electronicdevice with a movable housing configured to move toward or away from auser's skin in response to an electrical signal from a tensioner.

FIG. 20B depicts a side plan view of the example wearable electronicdevice of FIG. 20A, depicting the movable housing in an elevatedposition.

FIG. 21A depicts a top plan view of an example wearable electronicdevice with a pin and eyelet and interlacing band system configured suchthat the pin moves along the longitudinal axis of the band system inresponse to an electrical signal from a tensioner.

FIG. 21B depicts a side plan view of the example wearable electronicdevice of FIG. 21A.

FIG. 22 is a flow chart that depicts example operations of a method oftightening the fit of a wearable electronic device.

FIG. 23 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device.

FIG. 24 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device prior toobtaining biometric data with a biometric sensor.

FIG. 25 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device as a meansof soliciting a user's attention.

FIG. 26 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device inresponse to heightened user activity.

The use of the same or similar reference numerals in different drawingscan indicate similar, related, or identical items.

DETAILED DESCRIPTION

Embodiments described herein relate to systems and methods for dynamicadjustment of the fit of wearable electronic devices. It should beappreciated that the various embodiments described herein, as well asfunctionality, operation, components, and capabilities thereof may becombined with other elements, embodiments, structures and the like, andso any physical, functional, or operational discussion of any element orfeature is not intended to be limited solely to a particular embodimentto the exclusion of others.

As noted above, many portable electronic devices may be removablyattached to a user. In some examples, a heart rate sensor may beattached to a user's chest by a strap. In another example, a portableaudio player may be secured to a user's arm by inserting the player intoan armband case. In another example, a wearable electronic device suchas a smart watch or a fitness device can be attached to a user's wristby joining free ends of a conventional watch band together. In otherexamples, a clasp or an elasticated band may be used to secure thewearable electronic device.

Although many embodiments are described herein with reference to wristbands for attaching a wrist-worn electronic device to a user, one mayappreciate that other form factors may be favored in other embodiments.In other words, the methods, systems, and techniques described hereinwith illustrative reference to wrist-worn devices may be equally appliedto non-wrist worn devices. For example, in other embodiments, devicesmay be configured to attach to other limbs or body portions (e.g.,necklaces, arm bands, waistbands, ear hooks, finger rings, anklets, toerings, chest wraps, head bands, etc.). Furthermore, other embodimentsdescribed herein may be applied to dynamically adjust the fit of anelectronic device to a non-user object such as a charging stand orstation. In other embodiments, an electronic device can be fit toanother biological subject such as an animal (e.g., pet collar).

As noted above, many conventional watch bands may be uncomfortable,painful, or bothersome if improperly fit to a user. For example, auser's skin and/or hair may be pinched or pulled if a conventional watchband is improperly fit. In another example, a user may be irritated by awatch that slides up and down a user's wrist and/or rotates about theuser's wrist during use.

In other cases, the fit of a conventional watch band may be differentand/or may be perceived to be different given different situations. Forexample, in humid conditions, the fit of a band may be perceived to betighter. In another example, a user who is sweating may perceive the fitof a band to be looser. In many cases, these problems can be exacerbatedduring periods of heightened activity, such as while running or playingsports.

Despite the prevalence of issues associated with improperly fit bands,adjusting the size or fit of conventional watch bands often requiresmultiple steps, specialized tools, and/or technical expertise. Forexample, a metal link band may require specialized tools to remove oneor more links of the band to resize the band. In other cases, a leatherband with a deployment clasp may need to be physically cut to size inorder to resize the band.

In other cases, watch bands may have limited fit adjustment incrementsavailable. For example, a conventional watch band may space sizingeyelets approximately 8 mm apart. In some cases, a user may prefer a fitcorresponding to a location between two eyelets. In some examples,especially for users having relatively small wrists, an error of ±4 mm(e.g., example of error halfway between “too tight” and “too loose”) cancorrespond to an error upwards of ±5% of the circumference of thatuser's wrist, which, for many users, may be intolerable.

As a result, users of conventional wristwatches and/or fitness/healthtracking devices may select a tolerable (although not optimallycomfortable) fit, reserving tighter bands for fitness/health trackingdevices and looser bands for conventional wristwatches.

However, as noted above, some wearable electronic devices, such as smartwatches, may be multi-purpose devices. For example, many smart watchesprovide both fitness/health tracking and timekeeping functionality.Thus, many users may wear a smart watch exclusively, instead ofperiodically switching between wearing a traditional wristwatch and aseparate fitness/health tracking device. In these examples, a user mayprefer the fit of a smart watch to vary with use. For example, a usermay prefer a looser fit in a timekeeping mode and a tighter fit in afitness/health tracking mode.

As may be appreciated, the inconvenience associated with repeatedresizing and reattachment of a conventional watchband may contribute todiminishing use of a wearable electronic device, which may, in turn,precipitate a customer retention problem for the manufacturer thereof.In other examples, such as for wearable electronic devices configured tocollect health-related information (e.g., pulse rate, blood oxygensaturation, blood pressure, insulin levels, etc.) or to providehealth-related notifications (e.g., prescription timing reminders,medical alerts, medical identification numbers, etc.), discontinued useof the wearable electronic device may lead to more serious consequencessuch as health problems, medical emergencies, and/or incomplete orinconsistent medial data collection.

Accordingly, many embodiments described herein relate to systems andmethods for dynamic adjustment of the fit of the wearable electronicdevices.

For example, certain embodiments described herein take the form ofmethods for adjusting the fit of a wearable electronic device secured bya band to a user, the method including the operations of receiving asignal with an instruction to adjust the fit of the band, selecting anoperational mode (e.g., tightening mode, loosening mode, flexibilitymode, rigid mode, etc.) of a tensioner coupled to electronic device, andactuating the tensioner based on the instruction.

In some embodiments, the signal received in the course of operatingmethods described herein may be generated within the wearable electronicdevice itself. For example, a wearable electronic device such as a smartwatch may periodically adjust its own fit. In other examples, thewearable electronic device can generate the signal in response to inputfrom a user. For example, a user can provide input to a touch screen ofthe wearable electronic device to indicate to the wearable electronicdevice the user's desire for the fit of the device to change, eitherwith increased tightness or decreased tightness.

In another example, the signal received may be generated by a secondaryelectronic device in communication with the wearable electronic device.For example, in some embodiments, a personal cellular phone incommunication with a wearable electronic device can provide a signal tothe wearable electronic device to adjust the fit thereof. In stillfurther embodiments, the signal received may be generated by a networkdevice such as a server. In these examples, the server in communicationwith the wearable electronic device can provide a signal to the wearableelectronic device to adjust the fit thereof.

In many cases, the instruction associated with the signal received inthe course of operating methods described herein may include one or morevalues that correspond to a mode with which the fit of the wearableelectronic device should be changed. For example, in some embodiments,the instruction can include a value or pointer (e.g., selection bit,function name, etc.) that indicates the tightness of the fit of thewearable electronic device should increase, corresponding to atightening mode. In another example, the instruction can include a valueor pointer that indicates the tightness of the fit of the wearableelectronic device should decrease, corresponding to a loosening.

In further examples, the instruction can also include a value or pointercorresponding to an amount or magnitude of change, either relative orabsolute. For example, an instruction as described above can include avalue or pointer indicating that the fit should be changed by 5%. Inanother example, an instruction as described above can include a valueor pointer indicating that the fit should be changed by shortening aband by 1 mm. In another example, an instruction as described above caninclude a value or pointer indicating that the fit should be changed byextending a portion of the housing of the wearable electronic device by3 mm. In another example, an instruction as described above can includea value or pointer indicating that the fit should be change by applyinga force of 0.1 Newtons to the band. In other embodiments, other valuesand/or pointers may be used.

In further examples, the instruction can include a value or pointercorresponding to a threshold of change. For example, an instruction asdescribed above can include a value or pointer indicating that the fitshould be changed by extending a portion of the housing of the wearableelectronic device until the portion comes into contact with the user'sskin and applies pressure of 1,000 N/m² (e.g., 0.15 psi). In otherembodiments, other threshold values and/or pointers may be used.

In many cases, and as described above, the instruction may be subdividedinto multiple parts (or subcomponents) including, in some examples, amode, a magnitude, and/or a threshold. In this manner, a variety offunctions can be performed. For example, a band can tighten or loosenwithout a target (e.g., “become generally tighter” or “become generallylooser”), can tighten or loosen by an increment (e.g., “become Xtighter” or “become X looser”), can tighten or loosen until a thresholdis reached (e.g., “become tighter until” or “become looser until”),apply a specific value of greater or less tightness (e.g., “applytightness X”), apply a tightness or looseness as a function of time(e.g., “become tighter for 1 second, then loosen”).

As noted above, a tensioner can be coupled to the wearable electronicdevice. In many cases, a tensioner can be an analog, digital, orintegrated circuit configured to apply an electrical signal to causetension (either directly or indirectly) to be applied to, or relievedform, the band. In other cases, a tensioner can be a physical apparatussuch as a motor, electromagnetic coil, or solenoid that can be actuatedto cause tension (either directly or indirectly) to be applied to, orrelieved form, the band. Accordingly, the term “tensioner” and relatedphrases and terminology is used herein to generally refer to a circuit,apparatus, controller, or program code executed by a processor, that isconfigured to cause, either directly or indirectly, tension in a band orstrap coupled to an electronic device housing to increase or decrease.

In some examples, a tensioner associated with and/or coupled to thewearable electronic device can also be coupled to a portion of the bandthat is configured to compress in response to an electrical signal. Forexample, a shape memory wire such as Nitinol can be formed in alongitudinal serpentine pattern within one or more portions of a band.The tensioner can increase a current (or voltage) applied to the Nitinolin response to an instruction to increase the tightness of the band orcan decrease a current (or voltage) applied to the Nitinol in responseto an instruction to decrease the tightness of the band. In response tothe increase or decrease in the length of the longitudinal andserpentine Nitinol, the band can experience an increase or decrease inlength which, in turn, can cause an increase or decrease the tightnessof the fit of the band.

In other examples, Nitinol can be formed in a serpentine pattern throughthe thickness or width of one or more portions of a band. In theseembodiments, the tensioner can increase a current (or voltage) appliedto the Nitinol in response to an instruction to decrease the tightnessof the band and, correspondingly, can decease a current (or voltage)applied to the Nitinol in response to an instruction to increase thetightness of the band. In response to the increase or decrease in thewidth and/or thickness of the band, the band can experience a respectivedecrease or increase in length which, in turn, decreases or increasesthe tightness of the fit of the band.

In some examples, one or more portions of a band can include a bladderin communication with a pump or actuator disposed within the housing ofthe wearable electronic device. The tensioner may be configured tocontrol the pressure applied by the pump to a fluid in communicationwith the bladder. In some cases the fluid can be a gas or a liquid. Forexample, in some embodiments, air can be used as the fluid incommunication with the bladder. In other cases, a liquid with a lowviscosity such as oil or water can be used as the fluid in communicationwith the bladder. In these embodiments, the tensioner can increase thepressure applied by the pump to the fluid in response to an instructionto increase the tightness of the band or can decrease the pressureapplied by the pump in response to an instruction to decrease thetightness of the band. In response to the increase or decrease inpressure, the bladder can experience an increase or decrease in volume,which, in turn, increases or decreases the tightness of the band.

In another embodiment, the tensioner can be connected to a coupling thatjoins the band at one or more points to the housing of the wearableelectronic device. In some examples, the coupling can be a lug thatextends from the housing of the wearable electronic device. In such anembodiment, the tensioner can withdraw the coupling into the housing ofthe wearable electronic device in response to an instruction to increasethe tightness of the band or can extend the coupling from the housing ofthe wearable electronic device in response to an instruction to decreasethe tightness of the band.

In another embodiment, the tensioner can be connected to an extendableportion of the housing of the wearable electronic device oriented toextend toward (or retract from) the user's skin. For example, in certainembodiments the extendable portion can extend toward a user's wrist or,in other examples, the extendable portion can retract from the user'swrist. In such an embodiment, the tensioner can extend the extendableportion in response to an instruction to increase the tightness of theband or can withdraw the extendable portion into the housing of thewearable electronic device in response to an instruction to decrease thetightness of the band.

In other embodiments, the tensioner may be coupled to, or configured tocontrol the operation of, one or more mechanisms, components, orapparatuses capable to reduce or increase one or more dimensions of theband. For example, in some cases, the tensioner can be coupled to anapparatus capable to increase or decrease the length of the band. Inanother example, the tensioner can be coupled to an apparatus capable toincrease or decrease the thickness of the band. In other examples, thetensioner can be coupled to an apparatus capable to increase or decreasethe width of the band. In still further examples, the tensioner can becoupled to an apparatus capable to increase or decrease the rigidity ofthe band.

In other embodiments, the tensioner may be coupled to, or configured tocontrol the operation of, one or more mechanisms, components, orapparatuses capable to reduce or increase one or more dimensions of thehousing of the wearable electronic device. For example, as noted above,in some cases the tensioner can be coupled to an extendable portion thatcan extend toward or retract from a user's skin. In other examples, thetensioner can be coupled to a portion of the wearable electronic devicehousing that is configured to couple to the band itself. For example, asnoted above, the tensioner of some embodiments can be coupled to anapparatus capable to withdraw into the housing of the wearableelectronic device and also configured to extend from the housing of thewearable electronic device. In still further embodiments, alternativetensioner, band, and/or housing configurations, topologies, andinteractions are contemplated.

For example, some embodiments may include a configuration in which theinstruction received in the course of operating methods described hereinmay be based on a user input to the wearable electronic device. Forexample, a user may provide input to the wearable electronic device viaone or more input mechanisms such as a touch screen to indicate theuser's preference for the fit of the wearable electronic device totighten. In other examples, a user can provide input to the wearableelectronic device to indicate the user's preference for the fit of thewearable electronic device to loosen.

Still further embodiments may include a configuration in which theinstruction received in the course of operating methods described hereinmay be based on a user setting accessible to the wearable electronicdevice. For example, in some cases the wearable electronic device mayaccess a secondary portable electronic device, a remote server, or amemory within the wearable electronic device itself to obtain anindication of a user's preference for the fit of the wearable electronicdevice. In some cases, a wearable electronic device can query a portableelectronic device in communication therewith for a value correspondingto a user's preference for the tightness of the fit of the wearableelectronic device. After obtaining the value from the portableelectronic device, the wearable electronic device can provide the valueto the tensioner in order to obtain or maintain the user's preferredfit.

Still further embodiments may include a configuration in which theinstruction received in the course of operating methods described hereinmay be based on an output from a sensor in communication with thewearable electronic device. For example, in some embodiments, thewearable electronic device can include a tension sensor that can beconfigured to obtain a measurement or an approximation of the tightnessof the band. In response to a tightness measurement above a selectedthreshold, the tension sensor can provide a signal to the wearableelectronic device that the wearable electronic device can provide to thetensioner in order to loosen the fit of the band. Conversely, inresponse to a tightness measurement below a selected threshold, thetension sensor can provide a signal to the wearable electronic devicethat the wearable electronic device can provide to the tensioner inorder to tighten the fit of the band. In still further examples, inresponse to a tightness measurement between selected thresholds, thetension sensor can provide a signal to the wearable electronic devicethat the wearable electronic device can use to determine that anadjustment of the fit of the wearable electronic device is not required.

Still further embodiments may include a configuration in which theinstruction received in the course of operating methods described hereinmay be based on an operational state of the wearable electronic device.For example, if a wearable electronic device is operated in a fitnessmode, the tensioner can tighten the band to fit more snugly about theuser's wrist. In other examples, if a wearable electronic device isoperated in a non-fitness mode, the tensioner can loosen the band.

Still further embodiments may include a configuration in which theinstruction received in the course of operating methods described hereinmay be based on an operational state of a biometric sensor incommunication with the wearable electronic device. For example, somebiometric sensors may obtain more accurate or precise biometric data ifsaid biometric sensor is positioned within a certain distance of auser's skin.

For example, a photoplethysmographic (“PPG”) sensor may obtain moreaccurate and precise volumetric data if positioned in close proximity toa user's skin. In these embodiments, a biometric sensor in communicationwith the wearable electronic device may request an increase in tightnessof the fit of the wearable electronic device prior to obtaining data.Similarly, after obtaining biometric data, the biometric sensor mayrequest to return the fit of the wearable electronic device to theuser's preferred fit.

In many cases, other embodiments described herein relate to methods ofusing a wearable electronic device having a dynamically adjustable fit.For example, some embodiments described herein relate to a method ofsoliciting attention (e.g., notifying by providing haptic output) of auser by adjusting the fit of a wearable electronic device secured to theuser by a band. The method can begin by receiving an instruction tosolicit attention of the user of some event, condition, data, or otherinformation, and in response, actuate a tensioner coupled to thewearable electronic device to cause an increase in the tightness of theband. For example, a user may desire to be notified of an incoming emailmessage. Upon receiving an indication that a new email message isreceived (or is being received), the wearable electronic device canincrease the tightness of the band so as to quietly and discretelynotify the user of the message.

In other cases, embodiments described herein relate to other methods ofusing a wearable electronic device having a dynamically adjustable fit.For example, a wearable electronic device can be used to provide hapticfeedback for a cinema patron or a video game participant. In otherexamples, a wearable electronic device can be connected to homeautomation equipment. In such a case, a user may receive a notificationof a knock on the front door via a tightening of the wearable electronicdevice. In another case, a user may receive a notification of a cryingchild in another room via a tightening of the wearable device.

In still other examples, a wearable electronic device having adynamically adjustable fit can be used as an authentication device in atwo-factor authentication system. For example, if a user wishes toaccess financial details hosted on a banking website, the bankingwebsite may require both the user's credentials and a verification of anumber of tightening-loosening patterns sent to a wearable electronicdevice previously authenticated by the banking website. For example, auser can enter the user's credentials (e.g., username and password).Thereafter, the banking website can send a tactile pattern to a wearableelectronic device previously authenticated by the banking website. Inone example, a tactile pattern may be a series of five squeezes of theuser's wrist (e.g., tighten and loosen in sequence). The user maythereafter enter “5” to gain access to the banking website.

In another embodiment, the wearable electronic device may be operated ina fitness/health tracking mode. In these embodiments, the wearableelectronic device may tighten the fit of the band to count repetitionswhile the user is weight lifting. In another embodiment the wearableelectronic device may tighten the fit of the band to notify a runninguser of certain distance intervals (e.g., every kilometer). In anotherembodiment, the wearable electronic device may notify a swimmer of anupcoming turn.

In still further embodiments, the wearable electronic device, operatingas a navigation assistant, may tighten the fit of the band to notify auser to turn a certain direction. In these embodiments, the wearableelectronic device can tighten a right portion of a band to indicate aright turn and can tighten a left portion of a band to indicate a leftturn. In other embodiments, the wearable electronic device can tighten aband in order to wake a user from sleep. In another embodiment, theelectronic device can tighten based on the user's geographic location.For example, if a user arrives at a fitness center, the wearableelectronic device can tighten. Upon leaving the fitness center, thewearable electronic device can loosen.

Also described herein are methods of restraining a wearable electronicdevice secured by a strap to a user engaged in physical activity. Forexample, upon receiving an indication that the user may be engaged inphysical activity (e.g., via output from a motion and/or accelerationsensor), a wearable electronic device can actuate a tensioner coupled tothe wearable electronic device to increase the tightness of the strap.In one example, when a user begins a physical activity such as running,the wearable electronic device can respond by tightening around theuser's wrist in order to prevent undesirable motion of the wearableelectronic device about or along the user's wrist.

In many cases, other embodiments described herein relate to methods ofusing one or more wearable electronic devices having a dynamicallyadjustable fit as accessibility tools. For example, a user with sightimpairment may operate a wearable electronic device as a means fordiscretely navigating an unknown environment. For example, asight-impaired user may receive a notification via tightening of thewearable electronic device if the sight-impaired user is approaching anobstacle. In other examples, a hearing-impaired user may be notifiedwhen a loud sound is present of which the hearing-impaired user may notbe aware (e.g., knock at a door). In other embodiments, a wearableelectronic device such as described herein can provide compressiontherapy for a user with venous disorders. In some embodiments, awearable electronic device such as described herein can be used as anemergency immobilization cuff, tightening around an injury to preventmovement or blood loss.

FIG. 1A depicts a perspective view of an example wearable electronicdevice loosely attached by a band to a user. In the illustratedembodiment, the wearable electronic device 100 is implemented as aportable electronic device that is worn on the wrist of a user 102.Other embodiments can implement the wearable electronic devicedifferently. For example, the wearable electronic device can be a smartphone, a gaming device, a digital music player, a sports accessorydevice, a medical device, navigation assistant, accessibility device, adevice that provides time and/or weather information, a healthassistant, and other types of electronic device suitable for attachingto a user.

The wearable electronic device 100 includes a housing 104 and a display106. In many examples, the display 106 may incorporate an input deviceconfigured to receive user input. For example, a user can provide inputto the display 106 to indicate the user's intention to increase thetightness of the fit of the wearable device. In other examples, the usercan provide a force input to the display 106, the magnitude of which cancorrespond to the magnitude of tightness increase in the fit the userdesires to be implemented by the wearable electronic device 100.

The housing 104 can form an outer surface or partial outer surface andprotective case for one or more internal components of the wearableelectronic device 100. In the illustrated embodiment, the housing 104 isformed into a substantially rectangular shape, although thisconfiguration is not required and other shapes are possible in otherembodiments.

The housing 104 can be formed of one or more components operablyconnected together, such as a front piece and a back piece or a topclamshell and a bottom clamshell. Alternatively, the housing 104 can beformed of a single piece (e.g., uniform body or unibody).

The display 106 can be implemented with any suitable technology,including, but not limited to, a multi-touch sensing touchscreen thatuses liquid crystal display (LCD) technology, light emitting diode (LED)technology, organic light-emitting display (OLED) technology, organicelectroluminescence (OEL) technology, or another type of displaytechnology. In many embodiments, the display 106 can have a resolutionbeyond 200 pixels per inch. In many embodiments, the display 106 can bedisposed below a protective cover glass formed from a rigid and scratchresistant material such as ion-implanted glass, laminated glass, orsapphire.

As noted above, the display 106 can incorporate or be disposed proximateto an input sensor. For example, in some embodiments, the display 106can also include one or more contact sensors to determine the positionof one or more contact locations on a top surface of the display 106.For example, a contact sensor (such as a touch sensor or touch sensorarray) can detect the location of one or more objects engaging thedisplay 106, such as a stylus or a user's finger. In certainembodiments, a contact sensor can monitor an electrical property, suchas conductance or capacitance. Upon detecting that the electricalproperty has changed at a location or area of the display 106, thecontact sensor can report that an object is contacting the input surfaceat the specified location or area. In many cases, contact sensors mayreport the locations of all objects engaging the input surface. Forexample, a contact sensor may report two independent contact locationswhen a user positions two fingers on the display 106.

In some embodiments, the display 106 can also include one or moreforce-sensitive elements (not shown) to detect a magnitude of forceapplied to the top surface of the display 106. In some examples, theforce-sensitive elements can be mechanically coupled to the underside ofthe display 106. In other examples, force-sensitive elements can bedisposed around the perimeter of the display 106.

A force-sensitive element associated with the display 106 may be formedfrom a material or formed into a structure, such that upon applicationof a force (e.g., compression, expansion, tension, strain), one or moreelectrical properties of the material or structure can measurablychange. Force-sensitive electrical properties can include conductance,accumulated charge, inductance, magnetic field strength, electricalfield strength, capacitance, and so on. For example, a force-sensitiveelement formed from a piezoelectric material can accumulate charge inresponse to an applied force. In another example, a force-sensitiveelement can be formed as a structure (such as a number of layeredmaterials) having a capacitance that measurably varies with force. Inanother example, a force-sensitive element can be formed from astrain-sensitive material that may measurably change in conductance(e.g., resistance) in response to a force. In these and someembodiments, a known relationship (e.g., linear, exponential, and so on)between the electrical property or properties and force applied can beused to determine an amount of force applied to display 106.

The wearable electronic device 100 can include within the housing 104 aprocessor, a memory, a power supply and/or battery, networkcommunications, sensors, display screens, acoustic elements,input/output ports, haptic elements, digital and/or analog circuitry forperforming and/or coordinating tasks of the wearable electronic device100, and so on. In some examples, the wearable electronic device 100 cancommunicate with a separate electronic device via one or moreproprietary and/or standardized wired and/or wireless interfaces. Forsimplicity of illustration, the wearable electronic device 100 isdepicted in FIG. 1A without many of these elements, each of which may beincluded, partially, optionally, or entirely, within the housing 104.

The wearable electronic device 100 can be coupled to the user 102 via aband 108 that loops around the user's wrist. The band 108 can be formedfrom a compliant material, or into a compliant structure, that isconfigured to easily contour to a user's wrist, while retainingstiffness sufficient to maintain the position and orientation of thewearable electronic device on the user's wrist. The material selectedfor the band 108 may vary from embodiment to embodiment. For example, incertain cases, the band 108 can be formed from metal, such as a bandformed into a metal mesh. In other embodiments, the band 108 can beformed from an organic material such as leather. In further examples,the band 108 can be formed from an inorganic material such as nylon. Instill further embodiments, materials such as plastic, rubber, or otherfibrous, organic, polymeric, or synthetic materials may be used.

As can be appreciated, the relative stiffness of a band can impact thetightness with which the band may be fit to a user's wrist. For example,the more flexible the band 108, the tighter the band should be securedto prevent the wearable electronic device 100 from sliding, rotating, orotherwise displacing on the user's wrist.

In some embodiments, the band 108 can be formed from a polymer, such asa fluoroelastomeric polymer, having a Shore durometer selected forhaving flexibility suitable for easily contouring to a user's wristswhile maintaining sufficient stiffness to maintain support of thewearable electronic device 100 when attached to the wrist of user 102.For example, bands of certain embodiments may have a Shore A durometerranging from 60 to 80 and/or a tensile strength greater than 12 MPa.

In some embodiments, a fluoroelastomeric polymer (or other suitablepolymer) can be doped or treated with one or more other materials. Forexample, the polymer can be doped with an agent configured to providethe polymer with a selected color, odor, taste, hardness, elasticity,stiffness, reflectivity, refractive pattern, texture and so on. In otherexamples, the doping agent can confer other properties to thefluoroelastomeric polymer including, but not necessarily limited to,electrical conductivity and/or insulating properties, magnetic and/ordiamagnetic properties, chemical resistance and/or reactivityproperties, infrared and/or ultraviolet light absorption and/orreflectivity properties, visible light absorption and/or reflectivityproperties, antimicrobial and/or antiviral properties, oleophobic and/orhydrophobic properties, thermal absorption properties, pest repellantproperties, colorfast and/or anti-fade properties, deodorant properties,antistatic properties, medicinal properties, liquid exposure reactivityproperties, low and/or high friction properties, hypoallergenicproperties, and so on.

In some embodiments, one or more doping agents may be used. In furtherembodiments, the doping agents associated with one area of the band 108may be different from the doping agents associated with another area ofthe bands. In one example, a band may have a low friction dopant addedto the portion of a band that faces a user's wrist (e.g., bottomsurface) while having a high reflectivity dopant added to the portion ofthe band that faces outwardly (e.g., top surface).

In some embodiments, one or more doping agents may be used tointentionally increase the elasticity of one or more portions of theband 108. For example, in some embodiments, a band 108 may include acompressible region having a greater elasticity than other regions ofthe band 108. This region can be configured to compress in response toan electrical signal from the wearable electronic device 100. In otherexamples, the compressible region can also be configured to expand inresponse to an electrical signal from the wearable electronic device100.

In some examples, more than one compressible region can be used. Inthese cases, the several compressible regions of the band 108 can beindependently, sequentially, or simultaneously compressed or expanded inresponse to an electrical signal from the wearable electronic device.

In some embodiments, as noted above, the compressible regions can beformed via doping the material selected for the band 108 with a dopantthat increases the elasticity and/or compressibility of that selectedregion. In other examples, the compressible region(s) can be formed byhollowing a portion of the band 108. In other examples, the compressibleregion(s) can be formed by partially thinning a portion of the band 108.In still further examples, the compressible region(s) can be formed bycausing macroscopic, microscopic, or nanoscopic pockets to form withinthe band 108. For example, in one embodiment, pockets of gas can beinjected into a portion of the band. In another example, a portion ofthe band 108 can be intentionally weakened by microscopic perforations(e.g., via laser and/or water jet). In still further embodiments, aportion of the band can be formed as a foam, including many nano ormicroscopic cavities.

Other embodiments described herein include configurations in which theband 108 is formed from a non-compliant material into a compliantstructure. For example, a metallic mesh can be used to form band 108. Inother embodiments, the band can be formed by joining a number of metallinks. In other embodiments, the band can be formed by joining a numberof glass or crystal links.

In other embodiments, the band 108 can be formed form a combination ofcomplaint and non-compliant materials.

In many examples, the band 108 can be removably coupled to the housing104. For example, in certain embodiments, the band 108 can be at leastpartially looped around a watch pin that is configured to insert withinlugs extending from the body of the housing 104. In other examples, theband 108 can be configured to slide within and be retained by two ormore channels within external sidewalls of the housing 104. In otherexamples, the band 108 can be looped through and aperture in the housing104. In other cases, the band 108 can be riveted, screwed, or otherwiseattached to the housing 104 via one or more mechanical fasteners. Instill further embodiments, additional removable couplings between theband 108 and the housing 104 are possible.

In other examples, the band 108 can be permanently coupled to thehousing 104. For example, in some cases, the band 108 may be formed asan integral portion of the housing 104. In other cases, the band 108 canbe rigidly adhered to the housing 104 via an adhesive. In still furtherembodiments, the band 108 can be welded, soldered, or chemically bondedto the housing 104. In other embodiments, additional permanent couplingsbetween the band 108 and the housing 104 are possible.

As noted above, the housing 104 may be rigid and can be configured toprovide structural support and impact resistance for electronic ormechanical components contained therein. A rigid housing is notnecessarily required for all embodiments and, in some examples, thewearable electronic device 100 can have a housing may be flexible.Furthermore, although wearable electronic device housings are typicallyformed to take a rectangular shape, this is not required and othershapes are possible. For example, certain housings may take a circularshape.

In other embodiments, the wearable electronic device 100 can include oneor more sensors (not shown) positioned on a bottom surface of thehousing 104. Sensors utilized by the wearable electronic device 100 canvary from embodiment to embodiment. Suitable sensors can includetemperature sensors, electrodermal sensors, blood pressure sensors,heart rate sensors, respiration rate sensors, oxygen saturation sensors,plethysmographic sensors, activity sensors, pedometers, blood glucosesensors, body weight sensors, body fat sensors, blood alcohol sensors,dietary sensors, and so on.

In many cases, sensors such as biometric sensors can collect certainhealth-related information non-invasively. For example, the wearableelectronic device 100 can include a sensor that is configured to measurechanges in (or an amount of) light reflected from a measurement site(e.g., wrist) of the user 102. In one embodiment, the biometric sensorsuch as a PPG sensor can include a light source for emitting light ontoor into the wrist of the user 102 and an optical sensor to detect lightexiting the wrist of the user 102. Light from the light source may bescattered, absorbed, and/or reflected throughout the measurement sightas a function of various physiological parameters or characteristics ofthe user 102. For example, the tissue of the wrist of the user 102 canscatter, absorb, or reflect light emitted by the light sourcedifferently depending on various physiological characteristics of thesurface and subsurface of the user's wrist.

In many cases a PPG sensor can be used to detect a user's heart rate andblood oxygenation. For example, during each complete heartbeat, a user'ssubcutaneous tissue can distend and contract, alternatingly increasingand decreasing the light absorption capacity of the measurement site. Inthese embodiments, the optical sensor of the PPG can collect lightexiting the measurement site and generate electrical signalscorresponding to the collected light. Thereafter, the electrical signalscan be conveyed as raw data to the wearable electronic device 100, whichin turn can process the raw data into health data 110. The raw data canbe based on information about the collected light, such as thechromaticity and/or luminance of the light. In some cases, the healthdata 110 can be shown on the display 106 as biometric feedback to theuser 102.

However, certain sensors such as PPG sensors may be susceptible to noiseassociated with ambient light, surface conditions of the measurementsite (e.g., cleanliness, hair, perspiration, etc.), proximity of theoptical sensor and/or light source to the measurement site, and motionartifacts caused by the relative motion between the wearable electronicdevice 100 and the user 102. As a result, if the wearable electronicdevice 100 is not snugly fit to the user 102 (at least while the PPGsensor is obtaining a measurement), for example as illustrated in FIG.1A, the health data 110 obtained from the sensor may be sub-optimal(e.g., insufficient or insignificant magnitude) as a direct result ofthe improper fit. Alternatively, if the wearable electronic device 100is snugly fit to the user 102, for example as illustrated in FIG. 1B,the health data 110 obtained from the sensor may be of substantiallyimproved quality, magnitude, and clarity.

Although FIGS. 1A-1B are sequentially illustrated to show an improvementin the quality of health data 110 obtained by tightening the band 108,one can appreciate that in certain embodiments, the wearable electronicdevice 100 may dynamically resize the band 108 and/or the fit of thewearable electronic device 100 for reasons unrelated to sensor dataquality.

For example, as mentioned above, a tensioner (not shown) can be coupledto the wearable electronic device 100. In some examples, the tensionercan be included within the housing 104. In other examples, the tensionercan be included within the band 108. In still further examples, aportion of the tensioner can be included within the housing 104 and aportion of the tensioner can be included within the band 108. In someexamples, the tensioner can be coupled to the band 108 and to thehousing 104. For example, the tensioner can take the form of a couplingand/or a lug by which the band 108 couples to the housing 104.

In many cases, a tensioner can be an analog, digital, or integratedcircuit configured to apply an electrical signal to cause tension(either directly or indirectly) to be applied to, or relieved form, theband 108. In other cases, a tensioner can be a physical apparatus suchas a motor, electromagnetic coil, or solenoid that can be actuated tocause tension (either directly or indirectly) to be applied to, orrelieved form, the band 108.

For example, in some embodiments, a tensioner can apply an electricalcurrent or voltage to an element that contracts or expands in thepresence of an electrical current (e.g., piezoelectric materials, memorywire, electroactive polymers, etc.). In other examples, the tensionercan apply a current to an electromagnetic coil positioned proximate to aferromagnetic material within the band. An increase in the currentapplied to the electromagnetic coil can cause a corresponding increasein the magnetic flux produced and, thus, an increase in the attractiveforce between the coil and the ferromagnetic material. In otherembodiments, a permanent magnet can be disposed within the band suchthat the electromagnetic coil can be actuated to either repel or attractthe permanent magnet. In still further examples, the tensioner can beimplemented as a motor geared to a worm gear that either extends orretracts the band. In other examples, the tensioner can be implementedas a linear actuator. In other examples, the tensioner can beimplemented as a fluid control system that is configured to increase ordecrease the pressure and/or volume of a fluid within a particularportion of the band 108 or the housing 104. In other embodiments, thetensioner can be implemented as a combination of cooperating systems.

FIG. 2A depicts a top plan view of an example wearable electronic device200 with a two-piece band system for attaching to a user. The wearableelectronic device 200 can include a tensioner (not illustrated) in orderto provide dynamic adjustment of the fit of the wearable electronicdevice 200. As with other embodiments described herein, the tensionermay alter the fit of the wearable electronic device 200 in a number ofways. For example, the tensioner can adjust one or more dimensions of aband coupled to the wearable electronic device. In another example, thetensioner can adjust a coupling between a band and the wearableelectronic device. In another example the tensioner can adjust theposition of the housing of the wearable electronic device relative tothe band. In still other embodiments, other adjustments are possible.

In the illustrated embodiment, the wearable electronic device 200 isimplemented as a portable electronic device that is adapted to be wornby a user, such as shown in FIGS. 1A-1B. Other embodiments can implementthe wearable device differently. For example, the wearable device can bea smart phone, a gaming device, a digital music player, a sportsaccessory device, a medical device, a device that provides time and/orweather information, a health assistant, and other types of electronicdevice suitable for attaching to a user.

As with the embodiments depicted in FIGS. 1A-1B, the wearable electronicdevice 200 can include a housing and a display. In many examples, thedisplay may incorporate an input device configured to receive touchinput, force input, or other input from a user. The wearable electronicdevice 200 may also include one or more buttons or input ports (notshown). The housing can form a protective case for the internalcomponents of the wearable electronic device 200. In the illustratedembodiment, the housing is formed into a substantially rectangularshape, although this configuration is not required.

The wearable electronic device 200 can be permanently or removablyattached to a band that is illustrated as a two-part band systemincluding a first band 202 and a second band 204. In some embodiments,when attaching to a user's wrist, the first band 202 can be configuredto overlap the second band 204, for example as depicted in FIG. 2B. Inother embodiments, the first band 202 can be configured in amortise-tenon relationship with the second band 204, such as depicted inFIG. 2C. In still further embodiments, the first band 202 can beconfigured to insert within an aperture of the second band 204 such thatthe first band 202 and the second band 204 interlace, such as depictedin FIG. 2D. In other embodiments, other relationships between the firstband 202 and the second band 204 can be established.

The initial attachment between the first band 202 and the second band204 (regardless whether the interaction is overlapping, interlacing,mortise-tenon or otherwise) is referred to herein as a “coarse” fit. Acoarse fit may not provide users of the wearable electronic device 200with a sufficiently many increments to find an optimally comfortable orpreferred fit. For example, a coarse fit for the wearable electronicdevice 200 may be different when the user is operating the wearableelectronic device 200 as a fitness/health tracker than when the sameuser is operating the wearable electronic device 200 as a conventionaltimekeeping device.

As with the embodiment depicted in FIGS. 1A-1B, the first band 202 andthe second band 204 can each be formed from a compliant material or intoa compliant structure that is configured to easily contour to a user'swrist, while retaining stiffness sufficient to maintain the position andorientation of the wearable electronic device on the user's wrist. Insome embodiments, the first band 202 and the second band 204 may beformed from the same material, but this is not necessarily required. Forexample, in some embodiments the first band 202 can be formed from aleather material and the second band 204 can be formed from a metalmaterial. In certain embodiments, the first band 202 and the second band204 are each formed from a fluoroelastomeric polymer. In still furtherembodiments, materials such as plastic, rubber, or other fibrous,organic, polymeric, or synthetic materials may be used.

As noted above, the relative stiffness of the first band 202 and thesecond band 204 can impact the tightness with which the band may be fitto a user's wrist. Accordingly, in many embodiments, the wearableelectronic device 200 may be configured to adjust one or more dimensionsof the first band 202 or the second band 204. In other embodiments, thewearable electronic device 200 may be configured to adjust the couplingbetween the first band 202, the second band 204 and the housing of thewearable electronic device. In other embodiments, the wearableelectronic device may be configured to adjust the housing itself.

For example, in some embodiments, the length of the first band 202 canbe increased or decreased in order to adjust the fit of the wearableelectronic device 200. In these embodiments, the shorter the length ofthe first band 202, the tighter the fit of the wearable electronicdevice 200 may be. Similarly, the longer the length of the first band202, the looser the fit of the wearable electronic device 200 may be.Length adjustments to the first band 202 are shown in FIG. 2A with abi-directional arrow labeled as adjustment A1.

In some embodiments, the length of the second band 204 can be increasedor decreased in order to adjust the fit of the wearable electronicdevice 200. In these embodiments, the shorter the length of the secondband 204, the tighter the fit of the wearable electronic device 200 maybe. Similarly, the longer the length of the second band 204, the looserthe fit of the wearable electronic device 200 may be. Length adjustmentsto the second band 204 are shown in FIG. 2A with a bi-directional arrowlabeled as adjustment A2.

In some embodiments the adjustments A1, A2 can be carried outsimultaneously, sequentially, or individually. For example, in someembodiments, the adjustment A1 can be carried out independent of theadjustment A2. In other words, the length of the first band 202 can beincreased or decreased independent of any change in the length of thesecond band 204. In other embodiments, the adjustment A1 can be carriedout to a greater degree than the adjustment A2. In other words, thelength of the first band 202 can be increased or decreased by a greateramount than the any increase or decrease in the length of the secondband 204.

In some embodiments, the width of the first band 202 can be increased ordecreased in order to adjust the fit of the wearable electronic device200. In these embodiments, the wider the first band 202, the tighter thefit of the wearable electronic device 200 may be. Similarly, the thinnerthe first band 202, the looser the fit of the wearable electronic device200 may be. Width adjustments to the first band 202 are shown in FIG. 2Awith a bi-directional arrow labeled as adjustment A3.

In some embodiments, the width of the second band 204 can be increasedor decreased in order to adjust the fit of the wearable electronicdevice 200. In these embodiments, the wider the second band 204, thetighter the fit of the wearable electronic device 200 may be. Similarly,the thinner the second band 204, the looser the fit of the wearableelectronic device 200 may be. For illustrative simplicity, widthadjustments to the second band 204 are not illustrated in FIG. 2A.

In some embodiments width adjustments to the first band 202 and thesecond band 204 can be carried out simultaneously, sequentially, orindividually. For example, in some embodiments, the adjustment A3 can becarried out independent of any width adjustment to the second band 204.In other embodiments, the adjustment A3 can be carried out to a greaterdegree any width adjustment to the second band 204.

In some embodiments, the relationship between the housing of thewearable electronic device 200 and the first band 202 and the secondband 204 can be retracted or extended in order to adjust the fit of thewearable electronic device 200. In these embodiments, the more the firstband 202 and/or the second band 204 are retracted into the housing ofthe wearable electronic device, the tighter the fit of the wearableelectronic device 200 may be. Similarly, the more the first band 202and/or the second band 204 are extended from the housing of the wearableelectronic device 200, the looser the fit of the wearable electronicdevice 200 may be. Adjustments to the coupling between first band 202,the second band 204 and the housing of the wearable electronic deviceare shown in FIG. 2A with a bi-directional arrow labeled as adjustmentA4.

FIG. 2B depicts a side plan view of an example wearable electronicdevice, such as shown in FIG. 2A, with an overlapping two-piece bandsystem for attaching to a user. As with the embodiment depicted in FIG.2A, the wearable electronic device 200 can include a tensioner toprovide dynamic adjustment of the fit of the wearable electronic device200. The wearable electronic device 200 can include a housing at thatcan be permanently or removably attached to a band that is illustratedas a two-part band system including a first band 202 and a second band204.

As illustrated, the first band 202 and the second band 204 can beoverlapped in order to form a closed loop around a user's wrist. In someexamples, the first band 202 and the second band 204 can be affixedtogether with a traditional or conventional attachment mechanism. Forexample, in some embodiments, a buckling clasp can be used. In otherexamples a pin and eyelet attachment mechanism can be used.

Accordingly, and as with other embodiments described herein, the coarsefit of a wearable electronic device, such as the wearable electronicdevice 200 depicted in FIG. 2B can be adjusted by actuating a tensionerto adjust (or cause to be adjusted) one or more dimensions of the firstband 202, the second band 204, the housing of the wearable electronicdevice 200, or the coupling between them. For example, as describedabove, a tensioner may be configured to carry out the adjustments A1,A2, A3 and/or A4.

In addition, in some embodiments, the height of the wearable electronicdevice 200 can be increased or decreased in order to adjust the fit ofthe wearable electronic device 200 when attached to a user. In theseembodiments, the higher the housing of the wearable electronic device200 is with respect to the user's wrist, the looser the fit of thewearable electronic device 200 may be. Similarly, the lower the housingof the wearable electronic device 200 is with respect to the user'swrist, the tighter the fit of the wearable electronic device 200 may be.Height adjustments to the housing of the wearable electronic device 200are shown in FIG. 2B with a bi-directional arrow labeled as adjustmentA5.

Furthermore, in some embodiments, the thickness of the first band 202can be increased or decreased in order to adjust the fit of the wearableelectronic device 200. In these embodiments, the thicker the first band202, the shorter the first band 202, and thus the tighter the fit of thewearable electronic device 200 may be. Similarly, the thinner the firstband 202, the looser the fit of the wearable electronic device 200 maybe. Width adjustments to the first band 202 are shown in FIG. 2B with abi-directional arrow labeled as adjustment A6.

Furthermore, in some embodiments, the thickness of the second band 204can be increased or decreased in order to adjust the fit of the wearableelectronic device 200. In these embodiments, the thicker the second band204, the shorter the second band 204, and thus the tighter the fit ofthe wearable electronic device 200 may be. Similarly, the thinner thesecond band 204, the looser the fit of the wearable electronic device200 may be. For illustrative simplicity, thickness adjustments to thesecond band 204 are not illustrated in FIG. 2B.

As with other adjustments described herein, in some embodiments,thickness adjustments to the first band 202 and the second band 204 canbe carried out simultaneously, sequentially, or individually. Forexample, in some embodiments, the adjustment A6 can be carried outindependent of any thickness adjustment to the second band 204. In otherembodiments, the adjustment A6 can be carried out to a greater degreeany thickness adjustment to the second band 204.

In addition, in some embodiments, the relative alignment of the firstband 202 and the second band 204 can be changed in order to adjust thefit of the wearable electronic device 200. For example, the fartheralong the second band 204 the first band 202 is disposed, the tighterthe fit of the wearable electronic device 200 may be. Relative alignmentadjustments are shown in FIG. 2C with a bi-directional arrow labeled asadjustment A7.

FIG. 2C depicts a side plan view of an example wearable electronicdevice with a mortise-tenon band system for attaching to a user. As withthe embodiment depicted in FIG. 2A, the wearable electronic device 200can include a tensioner to provide dynamic adjustment of the fit of thewearable electronic device 200. The wearable electronic device 200 caninclude a housing at that can be permanently or removably attached to aband that is illustrated as a two-part band system including a firstband 202 and a second band 204. As illustrated, the first band 202 canbe inserted into a cavity opened within the second band 204 in order toform a coarse fit of closed loop around a user's wrist.

Accordingly, and as with other embodiments described herein, the coarsefit of a wearable electronic device, such as the wearable electronicdevice 200 depicted in FIG. 2C can be adjusted by actuating a tensionerto adjust (or cause to be adjusted) one or more dimensions of the firstband 202, the second band 204, the housing of the wearable electronicdevice 200, or the coupling between them. For example, as describedabove, a tensioner may be configured to carry out the adjustments A1,A2, A3, A4, A5, A6, and/or A7.

FIG. 2D depicts a side plan view of an example wearable electronicdevice with an interlacing band system for attaching to a user. As withthe embodiment depicted in FIG. 2A, the wearable electronic device 200can include a tensioner to provide dynamic adjustment of the fit of thewearable electronic device 200. The wearable electronic device 200 caninclude a housing at that can be permanently or removably attached to aband that is illustrated as a two-part band system including a firstband 202 and a second band 204. As illustrated, the first band 202 canbe inserted into an aperture of the second band 204 in order to form acoarse fit of closed loop around a user's wrist.

In many examples, the first band 202 can include one or more sizingeyelets into which a pin associated with the second band 204 can beinserted. In many examples, more than one eyelet can be formed withinthe first band 202, distributed at uniform or semi-uniform intervalsacross the length of the band. In some examples, the eyelets may bedistributed in a logarithmic or exponential distribution, or any othersuitable distribution. In these embodiments, the distribution of theeyelets may be based, at least in part, on the average wrist size of theexpected user. Some embodiments may not follow any mathematicaldistribution.

As illustrated, the second band 204 can include a concealment aperture(not visible) having a greater width than the first band 202. In someembodiments, the concealment aperture may be formed to have a widthapproximately equal to the width of the first band 202. The concealmentaperture may be configured to receive the first band 202 through it,thereby concealing a portion of the first band 202 between the secondband 204 and the user's wrist. In many embodiments, the concealmentaperture is formed to have the shape of a rounded rectangle (e.g.,“pill” shaped or “lozenge” shaped), although this shape is not required.

In many examples, the second band 204 can also include a pin (notillustrated) configured to be inserted in a selected eyelet of the firstband 202. Upon insertion into the eyelet, the pin can resist unintendedseparation of the first band 202 and the second band 204. In many cases,the pin may be formed from metal, ceramic, or plastic and/or may includeat least one surface finish configured to increase friction between thepin and the first band 202.

In many examples, the second band 204 can also incorporate a recessedguide bed (not visible) to receive and guide the inserted length offirst band 202. In many cases, the guide bed can be longitudinallycentered along the bottom surface of the second band 204. For theseembodiments, the combined thickness of the overlapping portions of thesizing and second band 204 may be reduced. In addition, the guide bedmay at least partially retain the inserted length of the first band 202in place behind the second band 204.

To attach the portable electronic device around a user's wrist, the endof the first band 202 can be fed around the wrist and through theconcealment aperture of the second band 204 so that the two bandsinterlace to form a closed loop. In many examples, the material selectedfor each band may have a low coefficient of friction such that theinsertable end of the first band 202 can slide into the concealmentaperture and against or past the user's skin without substantialresistance that might cause discomfort to the user. After insertion ofthe band-insertable end through the concealment aperture, the user canapply pressure to the first band 202 to push the first band 202 furtheralong the guide bed of the second band 204 in order to adjust thetightness against the limb. When an acceptable tightness is reached, theuser can push the pin of the second band 204 through the most proximateeyelet of the first band 202. In many embodiments, the process ofinserting the band-insertable end and tightening the first band 202 andthe second band 204 s may be comfortably and conveniently accomplishedwith the user's free hand.

To detach the portable electronic device from the wrist, the pin can bewithdrawn from the eyelet and the insertable end of the first band 202can be withdrawn from the concealment aperture. The process of removingthe insertable end and loosening the first band 202 and the second band204 may be comfortably and conveniently accomplished with the user'sfree hand.

As with other embodiments described herein, the coarse fit of a wearableelectronic device, such as the wearable electronic device 200 depictedin FIG. 2D can be adjusted by actuating a tensioner to adjust (or causeto be adjusted) one or more dimensions of the first band 202, the secondband 204, the housing of the wearable electronic device 200, or thecoupling between them. For example, as described above, a tensioner maybe configured to carry out the adjustments A1, A2, A3, A4, A5, A6 and/orA7.

One can appreciate that although many embodiments are described hereinwith reference to two-part bands for attaching wearable electronicdevices to users, that other bands are contemplated. For example, insome embodiments, a single-part band may be used. In other cases, asegmented band can be used.

Similarly, one may appreciate that the adjustments A1, A2, A3, A4, A5,A6 and/or A7 (and other adjustments) may apply equally or equivalentlyto other band and/or wearable electronic device embodiments describedherein. More generally, it should be appreciated that the variousexamples and embodiments presented herein can apply equally orequivalently to many band and/or wearable device embodiments and nosingle embodiment, or adjustments thereto by a tensioner or the wearableelectronic device itself, should be considered as limited to that singleembodiment.

FIG. 3A depicts a simplified block diagram of a wearable electronicdevice 300 configured to be coupled to a user by joining a first band302 with a second band 304 about the user's wrist. The wearableelectronic device 300 can one or more processing devices 306, memory308, one or more input/output (I/O) devices or sensors 310 (e.g.,biometric sensors, environmental sensors, etc.), one or more displays312, one or more power source(s) (not shown), one or more physicaland/or rotary input devices 314, one or more touch and/or force inputdevice(s) 316, one or more acoustic input and/or output devices 318, oneor more haptic output device(s) 320, one or more a network communicationinterface(s) 322, and one or more tensioner 324. Some embodiments canalso include additional components.

The display 312 may provide an image or video output for the wearableelectronic device 300. The display 312 may also provide an input surfacefor one or more input devices such as a touch sensing device 316, forcesensing device, temperature sensing device, and/or a fingerprint sensor.The display 312 may be any size suitable for inclusion at leastpartially within the housing of the wearable electronic device 300 andmay be positioned substantially anywhere on the wearable electronicdevice 300. In some embodiments, the display 312 can be protected by acover glass formed from a scratch-resistant material (e.g., sapphire,zirconia, glass, and so on) that may form a substantially continuousexternal surface with the housing of the wearable electronic device 300.

The processing device(s) 306 can control or coordinate some or all ofthe operations of the wearable electronic device 300. The processingdevice 306 can communicate, either directly or indirectly withsubstantially all of the components of the wearable electronic device300. For example, a system bus or signal line or other communicationmechanisms can provide communication between the processing device 306,the memory 308, the I/O device(s) 310, the power source(s), the networkcommunication interface 322, and/or the haptic output device 320.

The one or more processing devices 306 can be implemented as anyelectronic device capable of processing, receiving, or transmitting dataor instructions. For example, the processing device(s) 306 can each be amicroprocessor, a central processing unit (CPU), an application-specificintegrated circuit (ASIC), a digital signal processor (DSP), orcombinations of such devices. As described herein, the term “processingdevice” is meant to encompass a single processor or processing unit,multiple processors, multiple processing units, or other suitablyconfigured computing element or elements.

The memory 308 can store electronic data that can be used by thewearable electronic device 300. For example, a memory can storeelectrical data or content such as, for example, audio and video files,documents and applications, device settings and user preferences, timingand control signals or data for the haptic output device 320, datastructures or databases, and so on. The memory 308 can be configured asany type of memory. By way of example only, the memory can beimplemented as random access memory, read-only memory, Flash memory,removable memory, or other types of storage elements, or combinations ofsuch devices.

The one or more I/O device(s) 310 can transmit and/or receive data toand from a user or another electronic device. The I/O device(s) 310 caninclude a touch sensing input surface such as one or more buttons, oneor more microphones or speakers, and/or one or more ports such as amicrophone port.

The wearable electronic device 300 may also include one or more sensors310 positioned substantially anywhere on the wearable electronic device300. The sensor or sensors 310 may be configured to sense substantiallyany type of characteristic such as, but not limited to, images,pressure, light, touch, force, temperature, position, motion, and so on.For example, the sensor(s) 310 may be an image sensor, a temperaturesensor, a light or optical sensor, an atmospheric pressure sensor, ahumidity sensor, a magnet, a gyroscope, an accelerometer, and so on. Inother examples, the wearable electronic device 300 may include one ormore health sensors. In some examples, the health sensors can bedisposed on a bottom surface of the housing of the wearable electronicdevice 300.

The power source can be implemented with any device capable of providingenergy to the wearable electronic device 300. For example, the powersource can be one or more batteries or rechargeable batteries, or aconnection cable that connects the remote control device to anotherpower source such as a wall outlet. In other examples, wireless powercan be used.

The network communication interface 322 can facilitate transmission ofdata to or from other electronic devices across standardized orproprietary protocols. For example, a network communication interfacecan transmit electronic signals via a wireless and/or wired networkconnection. Examples of wireless and wired network connections include,but are not limited to, cellular, Wi-Fi, Bluetooth, infrared, andEthernet.

The haptic output device 320 can be implemented as any suitable deviceconfigured to provide force feedback, vibratory feedback, tactilesensations, and the like. For example, in one embodiment, the hapticoutput device 320 may be implemented as a linear actuator configured toprovide a punctuated haptic feedback, such as a tap or a knock.

As noted above, the wearable electronic device 300 can include atensioner 324. In many cases, a tensioner can be an analog, digital, orintegrated circuit configured to apply an electrical signal to causetension (either directly or indirectly) to be applied to, or relievedform, the first band 302 and the second band 304. In other cases, atensioner can be a physical apparatus such as a motor, electromagneticcoil, or solenoid that can be actuated to cause tension (either directlyor indirectly) to be applied to, or relieved form, the first band 302and/or the second band 304.

In response to a signal from the wearable electronic device, thetensioner can cause the first band 302 or the second band 304 to tightenand or loosen. In other embodiments, in response to a signal from thewearable electronic device 300, the tensioner can cause the housing ofthe wearable electronic device 300 to shift its position relative to thefirst band 302 or the second band 304.

As noted above, the signal to change the fit of the wearable electronicdevice 300 can be received from any number of sources. For example, incertain embodiments, the signal can be received from secondaryelectronic device through the network communication interface 322. Inother embodiments, the signal can be received as direct user input. Forexample, a user can provide input to the touch sensing device 316 of thewearable electronic device 300 to indicate to the wearable electronicdevice 300 and/or the tensioner 324 the user's desire for the fit of thedevice to change, either with increased tightness or decreasedtightness. For example, FIG. 3B depicts in perspective view a userproviding an indication to the wearable electronic device 300, via adisplay 312, to decrease the tightness of the band.

FIG. 4A depicts a top plan view of an example wearable electronic devicewith a two-piece band system configured to contract along its length inresponse to an electrical signal from a tensioner. In many cases thetensioner can be coupled to one or more actuators that, in response to asignal from the tensioner, adjust the fit of the wearable electronicdevice.

The wearable electronic device 400 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 402 and a second band 404.In the illustrated embodiment, a first actuator 406 can be disposedwithin the first band 402 and a second actuator 408 can be disposedwithin a second band 404. Both the first actuator 406 and the secondactuator 408 can be in electrical communication with a tensioner (notvisible), which may be disposed within the housing of the wearableelectronic device 400.

In the illustrated example, the first actuator 406 and the secondactuator 408 can be formed in a longitudinal serpentine pattern and canbe configured to contract or expand in response to an electrical signalfrom the tensioner. For example, in some embodiments, the first actuator406 and the second actuator 408 can be formed from a shape memory wiresuch as Nitinol. In these embodiments, the tensioner can increase acurrent (or voltage) applied to the Nitinol in response to aninstruction to increase the tightness of the band or can decrease acurrent (or voltage) applied to the Nitinol in response to aninstruction to decrease the tightness of the band. In many cases, anincrease in current applied to the Nitinol can cause the temperature ofthe Nitinol to increase, which can cause the Nitinol to contract.

In response to the increase or decrease in the length of thelongitudinal and serpentine Nitinol, the band can experience an increaseor decrease in length which, in turn, can cause an increase or decreasethe tightness of the fit of the band, for example as illustrated in FIG.4B. In this manner, the first actuator 406 and the second actuator 408can achieve the adjustment A1 and/or the adjustment A2 discussed withrespect to FIGS. 2A-2D.

In other embodiments, the first actuator 406 and the second actuator 408can be formed from another shape-memory wire, such as a copper-basedshape memory alloy. In other examples, another material can be used suchas electroactive polymer (either dielectric or ionic). In response to anelectrical signal from the tensioner, electroactive polymer can contractand/or expand to achieve the adjustments A1 and A2.

Although illustrated with a serpentine pattern, in other embodiments,other patterns can be used. For example, in other cases, a series ofparallel actuators can be included within either or both the bands. Inother examples, one or both of the actuators can be disposed along theentire length of one or both of the bands.

In other cases, the first actuator 406 and the second actuator 408 canbe disposed only through a portion of the first band 402 and the secondband 404. For example, FIG. 4C depicts the first actuator 406 asdisposed only along a portion of the length of the first band 402.Although illustrated to abut the housing of the wearable electronicdevice 400, one can appreciate that the first actuator 406 can bepositioned anywhere along the length of the first band 402. For example,in some embodiments, the first actuator 406 can be disposed in a middleportion of the first band 402. In other embodiments, the first actuator406 can be disposed in an end portion of the first band 402. In stillfurther embodiments, more than one actuator can be disposed within thefirst band 402. For example, one actuator can be placed within an endportion of the first band 402 and a second actuator can be positioned toabut the housing of the wearable electronic device 400.

In some embodiments, the first actuator 406 and the second actuator 408can be insert molded into the first band 402 and the second band 404respectively. In some cases, the first actuator 406 and the secondactuator 408 can be insert molded closer to a bottom surface of thefirst band 402 and the second band 404. In other cases, the firstactuator 406 and the second actuator 408 can be insert molded closer toa top surface of the first band 402 and the second band 404. In stillfurther examples, the first actuator 406 and the second actuator 408 canbe insert molded into the center of the first band 402 and the secondband 404.

In other cases, the first actuator 406 and the second actuator 408 canbe inserted into the first band 402 and the second band 404 after themolding of the first band 402 and the second band 404. For example,after molding, an incision path can be cut into the first band 402 andthe second band 404 that is shaped to fit the shape of the firstactuator 406 and the second actuator 408. In a subsequent manufacturingstep, the first actuator 406 and the second actuator 408 can be insertedinto the incision.

In other examples, the first actuator 406 and the second actuator 408can be formed with selective placement of dopants during the formationof the first band 402 and the second band 404.

In other examples, the first actuator 406 and the second actuator 408can be disposed on an exterior surface of the first band 402 and thesecond band 404. For example, in certain embodiments, the first actuator406 and the second actuator 408 can be disposed around the perimeter ofthe first band 402 and the second band 404.

In still further examples, one or both of the first actuator 406 and thesecond actuator 408 can be disposed or formed along an axis that is notparallel to the length of the first band 402 or the second band 404. Forexample, as illustrated in FIG. 4C, the second actuator 408 can bedisposed parallel to the width of the second band 404. In this example,contraction of the second actuator 408 can achieve an adjustment A3. Inother words, contraction of the second actuator 408 can cause the widthof the second band 404 to contract.

As may be appreciated, contraction of the width of the second band 404can cause the second band 404 to lengthen. In other words, by achievingthe adjustment A3, the adjustment A2 can also be achieved.

Similarly, and as depicted in the side plan view of FIG. 4D, someembodiments can dispose either or both the first actuator 406 and thesecond actuator 408 as a serpentine pattern through the thickness of thefirst band 402 or the second band 404. For example, as illustrated, thefirst actuator 406 can be disposed through the thickness of the firstband 402. As may be appreciated, contraction of the thickness of thefirst band 402 can cause the first band 402 to lengthen. In other words,by achieving the adjustment A6, the adjustment A1 can also be achieved.

FIG. 5A depicts a top plan view of an example wearable electronic devicewith a two-piece band system configured to retract into the body of thewearable electronic device in response to an electrical signal from atensioner. In many cases the tensioner can be coupled to one or moreactuators that, in response to a signal from the tensioner, adjust thefit of the wearable electronic device.

The wearable electronic device 500 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 502 and a second band 504.In the illustrated embodiment, a first actuator 506 can be partiallydisposed within the first band 502 and partially disposed within thehousing of the wearable electronic device. Similarly, a second actuator508 can be partially disposed within a second band 504 and partiallywithin the housing of the wearable electronic device. Both the firstactuator 506 and the second actuator 508 can be in electricalcommunication with a tensioner (not visible), which may be disposedwithin the housing of the wearable electronic device 500.

In the illustrated example, the first actuator 506 and the secondactuator 508 can be formed in a longitudinally-oriented serpentinepattern and can be configured to contract or expand in response to anelectrical signal from the tensioner. For example, as with theembodiment depicted in FIGS. 4A-4D, the first actuator 506 and thesecond actuator 508 can be formed from a shape memory wire such asNitinol.

In response to the increase or decrease in the length of thelongitudinal and serpentine Nitinol, the band can experience an increaseor decrease the tension with which the first band 502 and the secondband 504 are coupled to the housing of the wearable electronic device500, which, in turn, can cause an increase or decrease the tightness ofthe fit of the band. In this manner, the first actuator 506 and thesecond actuator 508 can achieve the adjustment A4.

In another embodiment, the tensioner can be connected to a coupling thatjoins the first band 502 and the second band 504 at one or more pointsto the housing of the wearable electronic device 500. In some examples,such as that depicted in FIG. 5B, the coupling can be a first lug 510and a second lug 512, associated with the first band 502 and the secondband 504 respectively, that each extend from the housing of the wearableelectronic device 500. In such an embodiment, the tensioner can withdrawthe first lug 510 and a second lug 512 into the housing of the wearableelectronic device 500 by applying an electrical signal to the firstactuator 506 and the second actuator 508 (shown in FIG. 5A).

In other examples, the first band 502 and the second band 504 can beconfigured to slide within (and be retained by) two or more channelswithin external sidewalls of the housing. In such an embodiment, such asthat depicted in FIG. 5C, the tensioner can withdraw first channel 514and a second channel 516, associated with the first band 502 and thesecond band 504 respectively, further into the housing of the wearableelectronic device 500 by applying an electrical signal to the firstactuator 506 and the second actuator 508. In another case, the tensionercan withdraw the portions of the first band 502 and the second band 504that are inserted into the channels further into the housing of thewearable electronic device 500 by applying an electrical signal to thefirst actuator 506 and the second actuator 508.

In other examples, the first band 502 and the second band 504 can belooped through and aperture in the housing. In such an embodiment, thetensioner can withdraw the aperture further into the housing of thewearable electronic device 500 by applying an electrical signal to thefirst actuator 506 and the second actuator 508. In other cases, thefirst band 502 and the second band 504 can be riveted, screwed, orotherwise attached to the housing via one or more mechanical fasteners.In such an embodiment, the tensioner can withdraw the one or moremechanical fasteners further into the housing of the wearable electronicdevice 500 by applying an electrical signal to the first actuator 506and the second actuator 508.

In other examples, the first band 502 and the second band 504 can bepermanently coupled to the housing, such as depicted in FIG. 5D. Forexample, in some cases, the first band 502 and the second band 504 maybe formed as an integral portion of the housing. In other cases, thefirst band 502 and the second band 504 can be rigidly adhered to thehousing via a first adhesive 520 and a second adhesive 522, associatedwith the first band 502 and the second band 504 respectively. In stillfurther embodiments, the first band 502 and the second band 504 can bewelded, soldered, or chemically bonded to the housing. In otherembodiments, additional permanent couplings between the first band 502and the second band 504 and the housing of the wearable electronicdevice 500 are possible. In these embodiments, the tensioner can apply awithdrawing force to the first band 502 and the second band 504 suchthat the first band 502 and the second band 504 contract at theirinterface with the housing.

FIG. 6A depicts a top plan view of an example wearable electronic devicewith a segmented band system configured to contract along its length inresponse to an electrical signal from a tensioner. In many cases thetensioner can be coupled to one or more actuators that, in response to asignal from the tensioner, adjust the fit of the wearable electronicdevice.

The wearable electronic device 600 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 602 and a second band 604.In the illustrated embodiment, the first band 602 and a second band 604can each be formed as a group of metallic links. In other embodimentsother materials can be used. For example, in some embodiments, glass,crystal, or rigid plastic can be used. In other examples, compliantmaterials can be used. In many cases, each link can be coupled toadjacent links via a hinging attachment. In other examples, each linkcan be coupled to adjacent links via an elasticated band.

In the illustrated embodiment, a first actuator 606 can be coupled tothe first band 602. Similarly, a second actuator 608 coupled to thesecond band 604. Both the first actuator 606 and the second actuator 608can be in electrical communication with a tensioner (not visible), whichmay be disposed within the housing of the wearable electronic device600.

In the illustrated example, the first actuator 606 and the secondactuator 608 can be configured contract or expand the first and/orsecond band in response to an electrical signal from the tensioner. Forexample, upon receiving a signal to contract (e.g., increase thetightness of the fit of the wearable electronic device 600, the links ofeach of the first band 602 and the second band 604 can be collapsedtogether, for example as shown in FIG. 6B

In one embodiment, the first actuator 606 can be formed as a series ofelectromagnetic coils disposed within each link of the first band 602and the second band 604. In this example, in response to an instructionto tighten the fit of the band, the tensioner can apply a current toeach of the electromagnetic coils so that the band collapses into theconfiguration shown in FIG. 6B.

In another embodiment, as with the embodiment depicted in FIGS. 4A-4D,the first actuator 606 and the second actuator 608 can be formed from ashape memory wire such as Nitinol. The Nitinol wire can be fed througheach of the links of each of the first band 602 and the second band 604.In some examples, the Nitinol can be fed through more than once, forexample in a serpentine pattern. In this example, in response to aninstruction to tighten the fit of the band, the tensioner can apply acurrent to the Nitinol wire so that the band collapses into theconfiguration shown in FIG. 6B.

In response to the increase or decrease in the length of the first band602 and the second band 604, tightness of the fit of the wearableelectronic device can respectively increase or decrease. In this manner,the first actuator 606 and the second actuator 608 can achieve theadjustment A1 and the adjustment A2.

FIG. 7A depicts a top plan view of an example wearable electronic devicewith a woven band system configured to contract along its length and/orwidth in response to an electrical signal from a tensioner. In manycases the tensioner can be coupled to one or more actuators that, inresponse to a signal from the tensioner, adjust the fit of the wearableelectronic device.

The wearable electronic device 700 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 702 and a second band 704.In the illustrated embodiment, the first band 702 and a second band 704can each be formed from a woven material. In many examples, a wovenmaterial can be made from a material that can be threaded, such as, butnot limited to, plastic, rubber, nylon, cotton, or other fibrous,organic, polymeric, or synthetic materials. In many cases, a wovenmaterial can be formed by drawing a weft thread 708 throughsubstantially parallel warp threads 710 in an patterned manner (e.g.,alternating, alternating every other warp, alternating every third warp,etc.), for example as shown in the detail view of FIG. 7B. Nominally,one weft thread can be separated from adjacent weft threads by adistance 712 that defines the tightness of the woven material.

In the illustrated embodiment, a first actuator can be coupled to thefirst band 702. Similarly, a second actuator coupled to the second band704. Both the first actuator 706 and the second actuator can be inelectrical communication with a tensioner (not visible), which may bedisposed within the housing of the wearable electronic device 700.

In the illustrated example, the first actuator and the second actuatorcan be configured contract or expand the first and/or second band inresponse to an electrical signal from the tensioner.

As with the embodiment depicted in FIGS. 4A-4D, the first actuator 706and the second actuator can be formed from a shape memory wire such asNitinol. In some cases the Nitinol wire can be threaded into the wovenmaterial forming the first band 702 and the second band 704. Forexample, in certain embodiments, the Nitinol wire can be one or morewarps of the woven material. In another example, the Nitinol wire can beone or more wefts of the woven material. In this example, in response toan instruction to tighten the fit of the band, the tensioner can apply acurrent to the Nitinol wire so that the band collapses into theconfiguration shown in FIG. 7C. In other embodiments, the first actuatorand the second actuator can be formed from another material, such as anelectroactive polymer.

In response to the increase or decrease in the length of the first band702 and the second band 704, tightness of the fit of the wearableelectronic device can respectively increase or decrease. In this manner,the first actuator and the second actuator can achieve the adjustment A1and the adjustment A2.

FIG. 8A depicts a top plan view of an example wearable electronic devicewith a two-part band system, each band configured to slide relative tothe other band in response to an electrical signal from a tensioner. Inmany cases the tensioner can be coupled to one or more actuators that,in response to a signal from the tensioner, adjust the fit of thewearable electronic device.

The wearable electronic device 800 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 802 and a second band 804.In the illustrated embodiment, a first actuator 806 can be partiallydisposed within the first band 802 and partially disposed within thehousing of the wearable electronic device. Similarly, a second actuator808 can be partially disposed within a second band 804 and partiallywithin the housing of the wearable electronic device. Both the firstactuator 806 and the second actuator 808 can be in electricalcommunication with a tensioner (not visible), which may be disposedwithin the housing of the wearable electronic device 800.

In the illustrated example, the first actuator 806 can be formed as apermanent magnet. The permanent magnet can be formed of any number ofsuitable magnetic materials. For example, in some embodiments, the firstactuator 806 can be formed from rare earth metals. In other examples,the first actuator 806 can be formed as a ceramic magnet.

In the illustrated example, the second actuator 808 can be formed as aseries of electromagnetic coils, illustrated as the coils 806 a-806 e.Upon overlapping the first band 802 with the second band 804, thetensioner can send an electrical signal to one of the coils 806 a-806 ein order to attract the permanent magnetic the first actuator 806. Forexample, as shown in FIG. 8B, the coil 808 b is activated by thetensioner so as to attract the permanent magnet of the first actuator806.

In response to a signal to tighten the fit of the band, the tensionercan apply an electrical signal to one or more adjacent of the coilsadjacent to the coil 808 b, or whichever coil 808 a-e was activated uponoverlapping the first band 802 with the second band 804. For example, asshown in FIG. 8C, coil 808 d can be activated so as to attract thepermanent magnet of the first actuator 806.

In this manner, in response to the increase or decrease in the length ofthe first band 802 and the second band 804, tightness of the fit of thewearable electronic device can respectively increase or decrease. Inthis manner, the first actuator 806 and the second actuator 808 canachieve the adjustment A7.

FIG. 9 depicts a side plan view of an example wearable electronic devicewith a bracelet-style band system configured to rotate the housing ofthe wearable electronic device toward or away from a user's wrist inresponse to an electrical signal from a tensioner. In many cases thetensioner can be coupled to one or more actuators that, in response to asignal from the tensioner, adjust the fit of the wearable electronicdevice.

The wearable electronic device 900 can include a housing at that can bepermanently or removably attached to a two-part band system including arigid bracelet-style band 902. In the illustrated embodiment, thehousing of the wearable electronic device 900 can be configured torotate about a pivot point to which the rigid bracelet-style band 902 iscoupled. For example, the wearable electronic device 900 can include anactuator (not shown) within the housing of the wearable electronicdevice 900 that can be electrically coupled to a tensioner (not shown)also disposed within the housing of the electronic device. In someembodiments, the actuator can be an electrical motor. In other examples,the actuator can be an electrical motor that, in other modes, is used toprovide haptic feedback to the user. For example, the actuator may be avibration motor.

In response to a signal to increase the tightness of the fit, thetensioner can cause the actuator to rotate the rigid bracelet-style band902 relative to the housing of the wearable electronic device 900. Byrotating the rigid bracelet-style band 902 toward the housing, thetightness of the fit can increase. By rotating the rigid bracelet-styleband 902 away from the housing, the tightness of the fit can decrease.

In this manner, in response to the increase or decrease relativepositioning of the rigid bracelet-style band 902 and the housing of thewearable electronic device 900, the tightness of the fit of the wearableelectronic device can respectively increase or decrease. In this manner,the actuator can achieve the adjustment A5.

FIG. 10 depicts a side plan view of an example wearable electronicdevice with a loop-style band system configured to tighten or loosen theloop in response to an electrical signal from a tensioner. In many casesthe tensioner can be coupled to one or more actuators that, in responseto a signal from the tensioner, adjust the fit of the wearableelectronic device.

The wearable electronic device 1000 can include a housing at that can bepermanently or removably attached to a two-part band system including acomplaint loop-style band 1002. In the illustrated embodiment, thehousing of the wearable electronic device 1000 can be configured toinsert through about an aperture within the housing through which thecomplaint loop-style band 1002 can be inserted, and folded back onitself. In some examples, the complaint loop-style band 1002 can beformed from a metallic mesh. In some of these examples, the metallicmesh can be formed from a ferromagnetic material such as steel. In theseexamples, the complaint loop-style band 1002 can also include apermanent magnet, such as a bar magnet along the free end of thecomplaint loop-style band 1002. In this manner, after the complaintloop-style band 1002 is inserted and folded back upon itself, thepermanent magnet can attract the complaint loop-style band 1002 itselfin order to hold its position.

In some embodiments, the wearable electronic device 1000 can include anactuator (not shown) at least partially within the housing of thewearable electronic device 1000 that can be electrically coupled to atensioner (not shown) also disposed within the housing of the electronicdevice. In some embodiments, the actuator can be an electrical motorthat includes a gear or high-friction portion that is configured andoriented to feed the complaint loop-style band 1002 through the aperturein the housing in response to a signal from the tensioner. In someexamples, the actuator can be an electrical motor that, in other modes,is used to provide haptic feedback to the user. For example, theactuator may be a vibration motor or a linear actuator.

In response to a signal to increase the tightness of the fit, thetensioner can cause the actuator to feed the complaint loop-style band1002 through the aperture in the housing of the wearable electronicdevice 1000. By feeding the complaint loop-style band 1002 through theaperture in the housing, the tightness of the fit can be increased ordecreased, depending upon the direction of the feed.

In this manner, in response to the increase or decrease relativepositioning of the complaint loop-style band 1002 and the housing of thewearable electronic device 1000, the tightness of the fit of thewearable electronic device can respectively increase or decrease. Inthis manner, the actuator can achieve the adjustment A5.

FIG. 11A depicts a side plan view of an example wearable electronicdevice with a bladder-style band system configured to increase ordecrease pressure within one or more bladders in response to anelectrical signal from a tensioner. In many cases the tensioner can becoupled to one or more actuators that, in response to a signal from thetensioner, adjust the fit of the wearable electronic device.

The wearable electronic device 1100 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1102 and a second band 1104.In the illustrated embodiment, the first band 1102 and a second band1104 can each be formed with one or more bladders that are incommunication with an actuator such as a pump that is disposed withinthe housing of the wearable electronic device 1100.

In the illustrated embodiment, a first actuator can be associated withthe first band 1102. Similarly, a second actuator can be associated withthe second band 1104. Both the first actuator and the second actuatorcan be in electrical communication with a tensioner (not visible), whichmay be disposed within the housing of the wearable electronic device1100.

The tensioner may be configured to control the pressure applied by theactuators to a fluid in communication with the bladders. In some casesthe fluid can be a gas or a liquid. For example, in some embodiments,air can be used as the fluid in communication with the bladder. In othercases, a liquid with a low viscosity such as oil or water can be used asthe fluid in communication with the bladder. In these embodiments, thetensioner can increase the pressure applied by the pump to the fluid inresponse to an instruction to increase the tightness of the band or candecrease the pressure applied by the pump in response to an instructionto decrease the tightness of the band. In response to the increase ordecrease in pressure, the bladder can experience an increase or decreasein volume, which, in turn, increases or decreases the tightness of theband, for example as depicted in FIG. 11B.

In response to the increase or decrease in the length of the first band1102 and the second band 1104, tightness of the fit of the wearableelectronic device can respectively increase or decrease. In this manner,the first actuator and the second actuator can achieve the adjustment A1and the adjustment A2.

FIG. 12A depicts a side plan view of an example wearable electronicdevice with another bladder-style band system configured to increase ordecrease pressure within one or more bladders in response to anelectrical signal from a tensioner. In many cases the tensioner can becoupled to one or more actuators that, in response to a signal from thetensioner, adjust the fit of the wearable electronic device.

The wearable electronic device 1200 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1202 and a second band 1204.In the illustrated embodiment, the first band 1202 and a second band1204 can each be formed with a first bladder 1206 and a second bladder1208, respectively, that each are in communication with an actuator suchas a pump that is disposed within the housing of the wearable electronicdevice 1200.

In the illustrated embodiment, a first actuator can be associated withthe first band 1202. Similarly, a second actuator can be associated withthe second band 1204. Both the first actuator and the second actuatorcan be in electrical communication with a tensioner (not visible), whichmay be disposed within the housing of the wearable electronic device1200.

The tensioner may be configured to control the pressure applied by theactuators to a fluid in communication with the first bladder 1206 and asecond bladder 1208. As with the embodiment depicted in FIGS. 11A-11B,the fluid can be any suitable fluid. In response to a request toincrease or decrease the tightness of the fit of the band of thewearable electronic device 1200, the tensioner can cause the actuatorsto increase or decrease the pressure of the first bladder 1206 and asecond bladder 1208. In response to the increase or decrease inpressure, the first bladder 1206 and a second bladder 1208 canexperience an increase or decrease in volume, which, in turn, increasesor decreases the tightness of the band, for example as depicted in FIG.12B.

In response to the increase or decrease in the length of the first band1202 and the second band 1204, tightness of the fit of the wearableelectronic device can respectively increase or decrease. In this manner,the first actuator and the second actuator can achieve the adjustment A1and the adjustment A2.

FIG. 13A depicts a side plan view of an example wearable electronicdevice with an extendable housing portion configured to extend toward orretract from a user's skin in response to an electrical signal from atensioner. In many cases the tensioner can be coupled to one or moreactuators that, in response to a signal from the tensioner, adjust thefit of the wearable electronic device.

The wearable electronic device 1300 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1302 and a second band 1304.In the illustrated embodiment, the housing of the wearable electronicdevice 1300 can include an extendable portion that can be configured toextend from a bottom surface of the housing toward the user's wrist.

In the illustrated embodiment, an actuator 1306 can be configured toextend the extendable portion. The actuator can be in electricalcommunication with a tensioner (not visible), which may be disposedwithin the housing of the wearable electronic device 1300.

In this embodiment, the actuator 1306 can cause the extendable portionof the housing of the wearable electronic device 1300 to extend towardor retract from the user's skin. For example, in certain embodiments theextendable portion can extend toward a user's wrist (see, e.g., FIG.13B) or, in other examples, the extendable portion can retract from theuser's wrist. In such an embodiment, the tensioner can cause theactuator 1306 to extend the extendable portion in response to aninstruction to increase the tightness of the band or the tensioner cancause the actuator 1306 to withdraw the extendable portion into thehousing of the wearable electronic device in response to an instructionto decrease the tightness of the band.

In some embodiments, the extendable portion can be formed from amaterial that contracts or expands in the presence of an electricalcurrent (e.g., piezoelectric materials, memory wire, electroactivepolymers, etc.). In other examples, the extendable portion can be formedas an electromagnetic coil positioned proximate to a permanent magnet(or other electromagnetic coil) coupled to a bottom surface of thehousing of the wearable electronic device 1300. An increase in thecurrent applied to the electromagnetic coil can cause a correspondingincrease in the magnetic flux produced and, thus, an increase in theattractive or repulsive force between the coil and the permanentmagnetic material.

In still further examples, the extendable portion can be extended with amotor geared to a worm gear that either extends or retracts theextendable portion. In other examples, the extendable portion can beimplemented as a linear actuator that extends or retracts the extendableportion. In other examples, the extendable portion can be implemented asa fluid pressure control system such as a pump that is configured toincrease or decrease the pressure and/or volume of a fluid that thencauses the extendable portion of the housing to extend or contract. Insome examples, the extendable portion can be mechanically biased by aspring. In some cases, the bias can cause the extendable portion to bebiased inwardly, in other cases, the bias spring can cause theextendable portion to be biased outwardly.

Furthermore, although illustrated as a large portion of the bottomsurface of the wearable electronic device 1300, one can appreciate thatin other embodiments, smaller extendable portions are possible. Forexample, in certain embodiments, an optical biometric sensor coupled tothe bottom surface of the housing of the wearable device (e.g., PPGsensor) may require one or more transparent or semi-transparent lensessuch that optical components of the sensor can be exposed to conditionsexternal to the housing of the wearable electronic device 1300. In someembodiments, these lenses can be extendable portions. For example, oneor more sensor lenses can extend or withdraw from contact with theuser's skin.

In this manner, in response to the increase or decrease in the height ofthe housing relative to the first band 1302 and the second band 1304,tightness of the fit of the wearable electronic device can respectivelyincrease or decrease. In this manner, the actuator can achieve theadjustment A5.

FIG. 14A depicts a side plan view of an example wearable electronicdevice with an extendable buckle portion configured to extend toward orretract from a user's skin in response to an electrical signal from atensioner. In many cases the tensioner can be coupled to one or moreactuators that, in response to a signal from the tensioner, adjust thefit of the wearable electronic device.

The wearable electronic device 1400 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1402 and a second band 1404.The first band 1402 and the second band 1404 can be joined by a bucklethat can include an extendable portion that can be configured to extendfrom a top surface of the buckle toward the user's wrist.

In the illustrated embodiment, an actuator 1406 can be configured toextend the extendable portion. The actuator can be in electricalcommunication, either wireless or wired, with a tensioner (not visible),which may be disposed within the housing of the wearable electronicdevice 1400.

In this embodiment, the actuator 1406 can cause the extendable portionof the buckle to extend toward or retract from the user's skin. Forexample, in certain embodiments the extendable portion can extend towarda user's wrist (see, e.g., FIG. 14B) or, in other examples, theextendable portion can retract from the user's wrist. In such anembodiment, the tensioner can cause the actuator 1406 to extend theextendable portion in response to an instruction to increase thetightness of the band or the tensioner can cause the actuator 1406 towithdraw the extendable portion into the buckle in response to aninstruction to decrease the tightness of the band.

As with the extendable portion described with respect to the embodimentdepicted in FIGS. 13A-13B, the extendable portion of the buckle can beimplemented using piezoelectric materials, electroactive polymers, pumpsand fluids, electromagnetic attraction and repulsion, and so on.

In this manner, in response to the increase or decrease in the height ofthe housing relative to the first band 1402 and the second band 1404,tightness of the fit of the wearable electronic device can respectivelyincrease or decrease. In this manner, the actuator 1406 can achieve theadjustment A5.

FIG. 15A depicts a side plan view of an example wearable electronicdevice with another extendable housing portion configured to extendtoward or retract from a user's skin in response to an electrical signalfrom a tensioner. In many cases the tensioner can be coupled to one ormore actuators that, in response to a signal from the tensioner, adjustthe fit of the wearable electronic device.

The wearable electronic device 1500 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1502 and a second band 1504.In the illustrated embodiment, the housing of the wearable electronicdevice 1500 can include a deformable portion that can be configured todeform away from a bottom surface of the housing toward the user'swrist.

In the illustrated embodiment, an actuator 1506 can be configured todeform the deformable portion. The actuator can be in electricalcommunication with a tensioner (not visible), which may be disposedwithin the housing of the wearable electronic device 1500.

In this embodiment, the actuator 1506 can cause the deformable portionof the housing of the wearable electronic device 1500 to deform towardor deform away from the user's skin. For example, in certain embodimentsthe deformable portion can deform toward a user's wrist (see, e.g., FIG.15B) or, in other examples, the deformable portion can deform away fromthe user's wrist. In such an embodiment, the tensioner can cause theactuator 1506 to deform the deformable portion in response to aninstruction to increase the tightness of the band or the tensioner cancause the actuator 1506 to withdraw the deformable portion toward thehousing of the wearable electronic device in response to an instructionto decrease the tightness of the band.

In addition, although the deformable portion is illustrated with anarcuate deformation, such a deformation is not required. For example, inother embodiments, other deformations are possible.

As with the deformable portion described with respect to the embodimentdepicted in FIGS. 13A-13B, the deformable portion of the buckle can beimplemented using piezoelectric materials, electroactive polymers, pumpsand fluids, electromagnetic attraction and repulsion, and so on.

In this manner, in response to the increase or decrease in the height ofthe housing relative to the first band 1502 and the second band 1504,tightness of the fit of the wearable electronic device can respectivelyincrease or decrease. In this manner, the actuator 1506 can achieve theadjustment A5.

FIG. 16 depicts a top plan view of an example wearable electronic devicewith another two-piece band system configured to retract toward the bodyof the wearable electronic device in response to an electrical signalfrom a tensioner. In many cases the tensioner can be coupled to one ormore actuators that, in response to a signal from the tensioner, adjustthe fit of the wearable electronic device.

The wearable electronic device 1600 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1602 and a second band 1604.In the illustrated embodiment, a first actuator 1606 can be partiallydisposed within the first band 1602 and partially disposed within thehousing of the wearable electronic device. Similarly, a second actuator1608 can be partially disposed within a second band 1604 and partiallywithin the housing of the wearable electronic device. Both the firstactuator 1606 and the second actuator 1608 can be in electricalcommunication with a tensioner (not visible), which may be disposedwithin the housing of the wearable electronic device 1600.

In response to the increase or decrease in the size of the firstactuator 1606 and the second actuator 1608, the band can experience anincrease or decrease the tension with which the first band 1602 and thesecond band 1604 are coupled to the housing of the wearable electronicdevice 1600, which, in turn, can cause an increase or decrease thetightness of the fit of the band. In this manner, the first actuator1606 and the second actuator 1608 can achieve the adjustment A4.

FIG. 17 depicts a top plan view of an example wearable electronic devicewith another two-piece band system configured to retract into the bodyof the wearable electronic device in response to an electrical signalfrom a tensioner. In many cases the tensioner can be coupled to one ormore actuators that, in response to a signal from the tensioner, adjustthe fit of the wearable electronic device.

The wearable electronic device 1700 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1702 and a second band 1704.In the illustrated embodiment, an actuator 1706 can be formed as springcan be coupled between the first band 1702 and the second band 1704through the housing of the wearable electronic device 1700. In someembodiments, the spring can be a passive spring. In other embodiments,the spring can be an active spring. For example, the spring can be madefrom a shape-memory material such as Nitinol. In such an embodiment, thetightness of a fit of the wearable electronic device 1700 can bemaintained by the tensioner by applying an electrical current to theNitinol.

In response to the increase or decrease in the tautness of the spring ofthe actuator 1706, can cause an increase or decrease the tightness ofthe fit of the band. In this manner, the actuator 1706 can achieve theadjustment A4.

FIG. 18 depicts a top plan view of an example wearable electronic devicewith another two-piece band system configured to retract toward the bodyof the wearable electronic device in response to an electrical signalfrom a tensioner. In many cases the tensioner can be coupled to one ormore actuators that, in response to a signal from the tensioner, adjustthe fit of the wearable electronic device.

The wearable electronic device 1800 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1802 and a second band 1804.In the illustrated embodiment, a first actuator 1806 can be partiallydisposed within the first band 1802 and partially disposed within thehousing of the wearable electronic device. Similarly, a second actuator1808 can be partially disposed within a second band 1804 and partiallywithin the housing of the wearable electronic device. Both the firstactuator 1806 and the second actuator 1808 can be in electricalcommunication with a tensioner (not visible), which may be disposedwithin the housing of the wearable electronic device 1800. In theseexamples, the first actuator 1806 and the second actuator 1808 can beworm gears (or other linear gears) that are in communication with a geardisposed within the housing of the wearable electronic device 1800.

In this manner, rotation of the gear can cause the first actuator 1806and the second actuator 1808 to either extend or to retract into thehousing. In many embodiments the gear can be coupled to electricalmotor. In other examples, the gear can be coupled to a haptic feedbackdevice disposed within the housing of the wearable electronic device1800. As a result, the first band 1802 and the second band 1804 canextend or retract. In this manner, the first actuator 1806 and thesecond actuator 1808 can achieve the adjustment A4.

FIG. 19A depicts a top plan view of an example wearable electronicdevice with another two-piece band system configured to contract alongits length in response to an electrical signal from a tensioner or inresponse to a user input. In many cases the tensioner can be coupled toone or more actuators that, in response to a signal from the tensioner,adjust the fit of the wearable electronic device.

The wearable electronic device 1900 can include a housing at that can bepermanently or removably attached to a band that is illustrated as atwo-part band system including a first band 1902 and a second band 1904.In the illustrated embodiment, a first actuator 1906 can be disposedwithin the first band. Similarly, a second actuator 1908 can be disposedwithin a second band 1904. The first actuator can be configured to beinserted into a buckle 1910, for example as shown in FIG. 19B.

Both the first actuator 1906 and the second actuator 1908 can be inelectrical communication with a tensioner (not visible), which may bedisposed within the housing of the wearable electronic device 1900.

In these examples, the first actuator 1906 and the second actuator 1908can be worm gears (or other linear gears) that are in communication witha gear 1912 disposed within the buckle 1910. In this manner, rotation ofthe gear can cause the first actuator 1906 and the second actuator 1908to either extend or to retract into the housing. In many embodiments thegear can be coupled to electrical motor. In other examples, the gear1912 may be turned manually by a user. As a result, the first band 1902and the second band 1904 can extend or retract. In this manner, thefirst actuator 1906 and the second actuator 1908 can achieve theadjustment A7.

FIG. 20A depicts a side plan view of an example wearable electronicdevice with a movable housing configured to move toward or away from auser's skin in response to an electrical signal from a tensioner. Thewearable electronic device 2000 can include a housing at that can bepermanently or removably attached to a two-part band system. In theillustrated embodiment, the housing of the wearable electronic device2000 can be configured to change the height of the housing of thewearable electronic device 2000 relative to a user's wrist and to theband, such as shown by the relative difference between FIG. 20A and FIG.20B. In this manner, in response to the increase or decrease relativepositioning of the band and the housing of the wearable electronicdevice 2000, the tightness of the fit of the wearable electronic devicecan respectively increase or decrease. In this manner, the wearableelectronic device 2000 can achieve the adjustment A5.

FIG. 21A depicts a top plan view of an example wearable electronicdevice with a pin and eyelet and interlacing band system configured suchthat the pin moves along the longitudinal axis of the band system inresponse to an electrical signal from a tensioner. As illustrated, afirst band 2102 and a second band 2104 can be overlapped in order toform a closed loop around a user's wrist. The first band 2102 can becoupled to the second band 2104 via a pin and eyelet attachmentmechanism as substantially described herein. In this embodiment, anactuator 2108 can be coupled to the eyelet, which itself can be coupledto the tensioner. In response to an instruction to loosen or tighten thefit of the wearable electronic device 2100, the tensioner can cause theactuator 2108 to move the eyelet along the longitudinal axis of thesecond band 2104. In this manner, the actuator 2108 to can achieve theadjustment A7, as shown for example in FIG. 21B.

FIG. 22 is a flow chart that depicts example operations of a method oftightening the fit of a wearable electronic device. The method can beginat operation 2202 in which a command is received to tighten a band of awearable electronic device by a selected amount. In some examples, theselected amount can be a value or pointer corresponding to an amount ormagnitude of tightness change, either relative or absolute. For example,the value or pointer can indicate that the fit should be tightened by5%.

In another example, the value or pointer can indicate that the fitshould be tightened by shortening a band by 1 mm. In another example,the value or pointer can indicate that the fit should be tightened byapplying a force of 0.1 Newtons to the band. In other embodiments, othervalues and/or pointers may be used.

The method can continue to operation 2204 in which a tensioner isactivated to begin tightening the band. Next, at operation 2206,tightening can be discontinued after the selected amount of tightnessincrease is obtained. In other embodiments, the method depicted in FIG.22 can be implemented by first received a command to loosen the band bya particular amount.

FIG. 23 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device. Themethod can begin at operation 2302 during which a signal can be receivedthat indicates the band tightness has changed from a previously obtainedor determined user-selected tightness. For example, in some embodiments,a sensor coupled to a band of the wearable electronic device canperiodically, continuously, or on request measure the strain within theband. Thereafter, the strain measurement can be correlated to (via aformula, algorithm output, or look-up table) what degree of tightnessthe measured strain corresponds to. In some examples strain can bemeasured with a piezoresistive strain sensor. Upon determining that thecurrent tightness of the band does not match (or has been measured to beoutside a threshold range of tightnesses), the method can continue tooperation 2304 in which the tightness of the band can be adjusted byeither activating or deactivating a tensioner mechanism such as anactuator that is mechanically coupled to the band itself. Thereafter,tightening or loosening can be terminated at operation 2306, once thenecessary tightness is obtained.

In many cases the threshold, threshold range, and/or other user-selectedsetting for tightness of the band can be obtained from a memoryassociated with the wearable electronic device. In other examples, theuser setting can be obtained from a third-party device, or a separateelectronic device in communication with the wearable electronic device.

FIG. 24 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device prior toobtaining biometric data with a biometric sensor. The method can beginat operation 2402 in which a command is received to obtain biometricdata, such as a user's pulse. Next, at operation 2404, a tighteningmechanism associated with the wearable electronic device can beactivated in order to increase the tightness of the wearable electronicdevice against the measurement site for obtaining a biometric datameasurement. Next, at operation 2406, tightening can be discontinuedonce it is determined that a tightness sufficient for obtainingbiometric data is obtained. Next, at operation 2408, biometric data canbe obtained. Finally, at operation 2410, the previously-applied tensioncan be released, and the band can be restored to its original tightness.

FIG. 25 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device as a meansof soliciting a user's attention. The method can begin at operation 2502by receiving a command to notify a wearer of the wearable electronicdevice. Next, at operation 2504, the wearable electronic device can betightened.

FIG. 26 is a flow chart that depicts example operations of a method ofdynamically adjusting the fit of a wearable electronic device inresponse to heightened user activity. The method can begin at operation2602 by receiving an indication that the user is engaged in heightedactivity. For example, in some embodiments, heighted user activity canbe detected by monitoring the output from one or more accelerometers,gyroscopes, inertial measurement units, global positioning sensors,proximity sensors, and the link. Next, at operation 2604, the wearableelectronic device can be tightened to prevent sliding during theheightened activity.

Many embodiments of the foregoing disclosure may include or may bedescribed in relation to various methods of operation, use, manufacture,and so on. Notably, the operations of methods presented herein are meantonly to be exemplary and, accordingly, are not necessarily exhaustive.For example an alternate operation order, or fewer or additional stepsmay be required or desired for particular embodiments.

The foregoing description, for purposes of explanation, used specificnomenclature to provide a thorough understanding of the describedembodiments. However, it will be apparent to one skilled in the art thatthe specific details are not required in order to practice the describedembodiments. Thus, the foregoing descriptions of the specificembodiments described herein are presented for purposes of illustrationand description. They are not meant to be exhaustive or to limit theembodiments to the precise forms disclosed. It will be apparent to oneof ordinary skill in the art that many modifications and variations arepossible in view of the above teachings. In particular, any featuresdescribed with respect to one embodiment may also be used in otherembodiments, where compatible. Likewise, the features of the differentembodiments may be exchanged, substituted, or omitted where compatibleand appropriate.

We claim:
 1. A watch comprising: a housing containing a processor; a first band portion extending from the housing; a second band portion extending from the housing; and a coupling for connecting the first band portion to the second band portion to form a loop for holding the housing against a wrist of a user, wherein the coupling is configured to, in response to a signal from the processor, adjust an amount of overlap between the first band portion and the second band portion.
 2. The watch of claim 1, wherein: the first band portion comprises a first actuator; and the second band portion comprises multiple second actuators, wherein the first actuator and one of the second actuators form the coupling.
 3. The watch of claim 1, wherein: the first band portion comprises a permanent magnet; and the second band portion comprises multiple electromagnetic coils, wherein the permanent magnet and one of the electromagnetic coils form the coupling.
 4. The watch of claim 1, wherein: the first band portion comprises an actuator, wherein the actuator is moveable along a longitudinal length of the first band portion; and the second band portion comprises multiple attachment mechanisms, wherein the actuator and one of the attachment mechanisms form the coupling.
 5. The watch of claim 1, wherein the coupling comprises a gear that engages the first band portion and the second band portion, wherein rotation of the gear adjusts the amount of overlap between the first band portion and the second band portion.
 6. A watch comprising: a housing containing a processor; a band positioned partially within the housing and extending away from the housing; and an actuator configured to, in response to a signal from the processor, adjust an amount of the band that is within the housing.
 7. The watch of claim 6, wherein the band is connected to the housing via the actuator.
 8. The watch of claim 6, wherein the actuator is formed in a serpentine pattern and is configured to contract in response to the signal from the processor.
 9. The watch of claim 6, wherein the housing forms a channel receiving the amount of the band.
 10. The watch of claim 6, wherein the actuator is of a shape memory wire.
 11. The watch of claim 6, wherein the band comprises a first band portion and a second band portion configured to be coupled together to form a loop.
 12. The watch of claim 11, wherein: the actuator is a first actuator between the first band portion and the housing; and the band comprises a second actuator between the first band portion and the housing and configured to, in response to the signal from the processor, adjust an amount of the second band portion that is within the housing.
 13. The watch of claim 11, wherein the housing comprises: a first channel receiving the amount of the first band portion; and a second channel receiving the amount of the second band portion.
 14. A watch comprising: a housing containing a processor; a band extending from opposing sides of the housing to form a loop for extending about a wrist of a user; and an actuator configured to, in response to a signal from the processor, adjust a length of the band such that a tightness of the loop about the wrist is adjusted, wherein the actuator is formed in a serpentine pattern and is configured to contract in response to the signal from the processor.
 15. The watch of claim 14, wherein the band forming the loop comprises a first band portion and a second band portion.
 16. The watch of claim 15, wherein the actuator is a first actuator within the first band portion and the band comprises a second actuator within the second band portion.
 17. The watch of claim 14, wherein the actuator is disposed around a perimeter of the band.
 18. The watch of claim 14, wherein the actuator is of a shape memory wire.
 19. The watch of claim 14, further comprising a biometric sensor operably coupled to the processor, wherein the processor is configured, in response to receiving an instruction to obtain biometric data, to send the signal to the actuator to adjust the length of the band prior to obtaining the biometric data from the biometric sensor. 